Study of global-scale ionospheric electric field dynamics using mid-latitude SuperDARN under common research infrastructure

• Project/Area Number: 18KK0099
• Research Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 17:Earth and planetary science and related fields
• Research Institution: Nagoya University
• Principal Investigator: 西谷 望 名古屋大学, 宇宙地球環境研究所, 准教授 (10218159)
• Co-Investigator(Kenkyū-buntansha): 堀 智昭 名古屋大学, 宇宙地球環境研究所, 特任准教授 (30467344) ; 新堀 淳樹 名古屋大学, 宇宙地球環境研究所, 特任助教 (30555678) ; 高橋 直子 国立研究開発法人情報通信研究機構, 電磁波研究所電磁波伝搬研究センター, 研究員 (90828089)
• Project Period (FY): 2018-10-09 – 2024-03-31
• Project Status: Granted (Fiscal Year 2022)
• Budget Amount: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000); Fiscal Year 2023: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2019: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2018: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
• Keywords: 中緯度SuperDARN / 電離圏 / 磁気圏 / SAPS / SED / 磁気流体波動 / 地理・地磁気軸オフセット効果

Outline of Annual Research Achievements

日米双方の中緯度SuperDARNレーダー装置・観測データを活用し、レーダー運用及びデータ解析環境の共通化を図った上で、地球自転軸と地磁気双極子軸のずれに起因する双方のレーダー観測域の地理的相違性に注目して、以下の課題に取り組む。1) SAPSやSEDに代表される電子密度・電場変動現象の空間・時間分布および地理・地磁気軸オフセット効果の影響。2)太陽風中擾乱やサブストーム現象が地球の磁気圏電離圏電場の空間・時間変動に与える影響。3)各種磁気流体波動の特性および地理・地磁気軸オフセット効果の影響。特に1分程度の短時間で劇的に変動する現象の特性およびその発生過程を明らかにすることが本研究課題の主要な目的である。
当該年度は大学院生を含む日本側研究者数名をアメリカ側代表研究機関に派遣し、またSuperDARN国際会議を始めとする複数の国際会議に派遣するする予定であったが、コロナ禍およびこの後のアメリカにおける物価高騰の影響により、オンラインによる研究交流・成果発表を代わりに実施した。並行して、アメリカ側研究者を1名日本に招聘し(2か月滞在)、太陽フレアによる電離圏電子密度・電場変動現象に関する共同研究を進めた。
また、北海道陸別町に設置したSuperDARN北海道-陸別第一・第二レーダーの運用を継続して実施するとともに、SuperDARNレーダー次世代受信機の開発を進めた。さらには名古屋大学が陸別に設置した既存のレーダーをはじめとするSuperDARNデータを活用した、日米の共同研究者を共著とする主な論文として、火山噴火による電離圏擾乱に関するものが1編、太陽風擾乱によるSudden Commencement(急始型電磁気擾乱)に関するものが1編出版された。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

2022年度は前年度に引き続き、直接相手側機関を訪問しての共同研究を実施したり、国際会議において同時に参加したアメリカ側の研究者と今後の共同研究計画の進め方について議論を行うことができなかったが、することができなかったが、先方の若手研究者を1名日本に招聘したり、オンライン会議や電子メールを活用することにより、共同研究を推進することができた。実際に成果論文が出版され、オンライン国際・国内会議における発表が多くなされた。
日本国内ではSuperDARN北海道-陸別第一・第二レーダーの運用を継続してデータを蓄積し、本格的な共同研究に備えるとともに、SuperDARNレーダー次世代受信機の開発を進めることができた。
2020年2月末頃から続いていたCOVID-19ウィルスの影響は終息しつつあるが、2022年度はアメリカ国内における物価高騰などで海外渡航が困難な状況にあった。2023年度には状況が改善すると期待される。

Strategy for Future Research Activity

可能な手段を活用して日米間の共同研究を進める。COVID-19の影響が終息しつつあり、日本側の研究者の共同研究機関のバージニア工科大学への派遣や、国内外で行われる国際会議への参加を積極的に進めるのと並行して、電子メールやオンライン会議等を通じて共通環境の整備を推進するとともに、その基盤の上で共同研究をさらに進める。
このように考えられる手段を活用して共通のレーダー運用・データ解析環境をより一層整備した上で、共同研究を進めていく。
一方で、日本国内でのSuperDARN観測を継続するとともに、SuperDARNレーダー次世代受信機の開発を進め、できるだけ早い時期(順調に行けば今年度)の本運用を目指す。アメリカ側の同様の機器の開発・運用状況について先方と密に連絡を取り合うことで能率的な情報交換を行っていく。

Research Products

• [Int'l Joint Research] バージニア工科大学/ダートマス大学/ペンシルベニア州立大学(米国)
• [Int'l Joint Research] サスカチュワン大学(カナダ)
• [Int'l Joint Research] GFZ Potzdam(ドイツ)
• [Int'l Joint Research] Umea大学(スウェーデン)
• [Int'l Joint Research] バージニア工科大学/アラスカ大学/ダートマス大学(米国)
• [Int'l Joint Research] サスカチュワン大学(カナダ)
• [Int'l Joint Research] Virginia Tech/Dartmouth College/Unversity of Alaska Fairbanks(米国)
• [Int'l Joint Research] University of Saskatchewan(カナダ)
• [Int'l Joint Research] University of Saskatchewan(カナダ)
• [Int'l Joint Research] National Space Science Center/Polar Research Institute of China(中国)
• [Int'l Joint Research] GFZ-Potsdam(ドイツ)
• [Int'l Joint Research] バージニア工科大学(米国)
• [Journal Article] Statistical study of seasonal and solar activity dependence of nighttime MSTIDs occurrence using the SuperDARN Hokkaido pair of radars (2022)
  • Author(s): Hazeyama, W., N. Nishitani, T. Hori, T. Nakamura, and S. Perwitasari
  • Journal Title: J. Geophys. Res. Volume: 127 Issue: 4
  • DOI: 10.1029/2021ja029965
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] On the Noise Estimation in Super Dual Auroral Radar Network Data (2022)
  • Author(s): P. V. Ponomarenko, E. C. Bland, K. A. McWilliams, N. Nishitani
  • Journal Title: Radio Science Volume: 57 Issue: 6
  • DOI: 10.1029/2022rs007449
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Interpretation of the theta aurora based on the null-separator structure (2022)
  • Author(s): Tanaka, T., Ebihara, Y., Watanabe, M., Fujita, S., Nishitani, N., & Kataoka, R.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 127 Issue: 8
  • DOI: 10.1029/2022ja030332
  • Peer Reviewed
• [Journal Article] Unified theory of the arc auroras: Formation mechanism of the arc auroras conforming general principles of convection and FAC generation (2022)
  • Author(s): Tanaka, T., Watanabe, M., Ebihara, Y., Fujita, S., Nishitani, N., & Kataoka, R.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 127 Issue: 9
  • DOI: 10.1029/2022ja030403
  • Peer Reviewed
• [Journal Article] Interaction Between Proton Aurora and Stable Auroral Red Arcs Unveiled by Citizen Scientist Photographs (2022)
  • Author(s): Y. Nishimura, E. Bruus, E. Karvinen, C. R. Martinis, A. Dyer, L. Kangas, H. K. Rikala, E. F. Donovan, N. Nishitani, J. M. Ruohoniemi
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 127 Issue: 7
  • DOI: 10.1029/2022ja030570
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Oscillations of the Ionosphere Caused by the 2022 Tonga Volcanic Eruption Observed With SuperDARN Radars (2022)
  • Author(s): Jiaojiao Zhang, Jiyao Xu, Wei Wang, Guojun Wang, J. Michael Ruohoniemi, Atsuki Shinbori, Nozomu Nishitani, Chi Wang, Xiang Deng, Ailan Lan, Jingye Yan
  • Journal Title: Geophysical Research Letters Volume: 49 Issue: 20
  • DOI: 10.1029/2022gl100555
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Small-Scale Irregularities Within Polarization Jet/SAID During Geomagnetic Activity (2022)
  • Author(s): A. A. Sinevich, A. A. Chernyshov, D. V. Chugunin, A. V. Oinats, L. B. N. Clausen, W. J. Miloch, N. Nishitani, M. M. Mogilevsky
  • Journal Title: Geophysical Research Letters Volume: 49 Issue: 8
  • DOI: 10.1029/2021gl097107
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Multi-scale Density Structures in the Plasmaspheric Plume during a Geomagnetic Storm (2022)
  • Author(s): Y. Nishimura, J. Goldstein, C. Martinis, Q. Ma, W. Li, S. R. Zhang, A. J. Coster, S. Mrak, J. L. Semeter, N. Nishitani, J. M. Ruohoniemi, S. G. Shepherd
  • Journal Title: J. Geophys. Res. Volume: 127 Issue: 3
  • DOI: 10.1029/2021ja030230
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Geospace Concussion: Global Reversal of Ionospheric Vertical Plasma Drift in Response to a Sudden Commencement (2022)
  • Author(s): ueling Shi, Dong Lin, Wenbin Wang, Joseph B. H. Baker, James M. Weygand, Michael D. Hartinger, Viacheslav G. Merkin, J. Michael Ruohoniemi, Kevin Pham, Haonan Wu, Vassilis Angelopoulos, Kathryn A. McWilliams, Nozomu Nishitani, Simon G. Shepherd
  • Journal Title: Geophysical Research Letters Volume: 49 Issue: 19
  • DOI: 10.1029/2022gl100014
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Electromagnetic conjugacy of ionospheric disturbances after the 2022 Hunga Tonga-Hunga Ha’apai volcanic eruption as seen in GNSS-TEC and SuperDARN Hokkaido pair of radars observations (2022)
  • Author(s): Shinbori, A., Y. Otsuka, T. Sori, M. Nishioka, S. Perwitasari, T. Tsuda, and N. Nishitani
  • Journal Title: Earth, Planets Space Volume: 74 Issue: 1 Pages: 106-106
  • DOI: 10.1186/s40623-022-01665-8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Excitation of two types of storm-time Pc5 ULF waves by ring current ions based on the magnetosphere-ionosphere coupled model (2022)
  • Author(s): Yamakawa, T., Seki, K., Amano, T., Miyoshi, Y., Takahashi, N., Nakamizo, A., & Yamamoto, K
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 127 Issue: 8
  • DOI: 10.1029/2022ja030486
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Statistical characteristics of mid-latitude ionospheric irregularities at geomagnetic quiet time: Observations from the Jiamusi and Hokkaido East SuperDARN HF radars (2022)
  • Author(s): Wang, W., Zhang, J. J., Wang, C., Nishitani, N., Yan, J. Y., Lan, A. L., et al.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 127 Issue: 1
  • DOI: 10.1029/2021ja029502
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Statistical behavior of large-scale ionospheric disturbances from high latitudes to mid-latitudes during geomagnetic storms using 20-yr GNSS-TEC data: Dependence on season and storm intensity (2022)
  • Author(s): Shinbori, A., Y. Otsuka, T. Sori, T. Tsugawa, and M. Nishioka
  • Journal Title: J. Geophys. Res. Volume: 127 Issue: 1
  • DOI: 10.1029/2021ja029687
  • Peer Reviewed / Open Access
• [Journal Article] Superfast precipitation of energetic electrons in the radiation belts of the Earth (2022)
  • Author(s): Zhang Xiao-Jia、Artemyev Anton、Angelopoulos Vassilis、Tsai Ethan、Wilkins Colin、Kasahara Satoshi、Mourenas Didier、Yokota Shoichiro、Keika Kunihiro、Hori Tomoaki、Miyoshi Yoshizumi、Shinohara Iku、Matsuoka Ayako
  • Journal Title: Nature Communications Volume: 13 Issue: 1 Pages: 1611-1611
  • DOI: 10.1038/s41467-022-29291-8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Simultaneous Observations of EMIC‐Induced Drifting Electron Holes (EDEHs) in the Earth's Radiation Belt by the Arase Satellite, Van Allen Probes, and THEMIS (2022)
  • Author(s): Nakamura S.、Miyoshi Y.、Shiokawa K.、Omura Y.、Mitani T.、Takashima T.、Higashio N.、Shinohara I.、Hori T.、Imajo S.、Matsuoka A.、Tsuchiya F.、Kumamoto A.、Kasahara Y.、Shoji M.、Spence H.、Angelopoulos V.
  • Journal Title: Geophysical Research Letters Volume: 49 Issue: 5 Pages: 1-12
  • DOI: 10.1029/2021gl095194
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of remote HF wave receiver in the backlobe direction of the SuperDARN Hokkaido East radar: Initial observations (2021)
  • Author(s): Nishitani Nozomu、Hamaguchi Yoshiyuki、Hori Tomoaki
  • Journal Title: Polar Science Volume: 2021 Pages: 100669-100669
  • DOI: 10.1016/j.polar.2021.100669
  • Peer Reviewed / Open Access
• [Journal Article] Evolution of mid-latitude density irregularities and scintillation in North America during the September 2017 storm (2021)
  • Author(s): Nishimura, Y., Mrak, S., Semeter, J. L., Coster, A. J., Jayachandran, P. T., Groves, K. M., D. J. Knudsen, N. Nishitani, and J. M. Ruohoniemi
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 6
  • DOI: 10.1029/2021ja029192
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Cusp dynamics and polar cap patch formation associated with a small IMF southward turning (2021)
  • Author(s): Nishimura, Y., Sadler, F. B., Varney, R. H., Gilles, R., Zhang, S. R., Coster, A. J., N. Nishitani, and A. Otto
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 5
  • DOI: 10.1029/2020ja029090
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Roles of the M-I coupling and plasma sheet dissipation on the growth-phase thinning and subsequent transition to the onset (2021)
  • Author(s): Tanaka, T., Ebihara, Y., Watanabe, M., Den, M., Fujita, S., Kikuchi, T., Hashimoto, K. K., Nishitani, N., & Kataoka, R.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 12
  • DOI: 10.1029/2021ja029925
  • Peer Reviewed
• [Journal Article] The role of flare-driven ionospheric electron density changes on the Doppler flash observed by SuperDARN HF radars (2021)
  • Author(s): Chakraborty, S., Qian, L., Ruohoniemi, J. M., Baker, J. B. H., Mclnerney, J. M., & Nishitani, N.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 8
  • DOI: 10.1029/2021ja029300
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Relationship between the locations of the mid‐latitude trough and plasmapause using GNSS‐TEC and Arase satellite observation data (2021)
  • Author(s): Shinbori Atsuki, Otsuka Yuichi, Tsugawa Takuya, Nishioka Michi, Kumamoto Atsushi, Tsuchiya Fuminori, Matsuda Shoya, Kasahara Yoshiya, Matsuoka Ayako
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: - Issue: 5
  • DOI: 10.1029/2020ja028943
  • NAID: 120007175395
  • Peer Reviewed / Open Access
• [Journal Article] Relative Contribution of ULF Waves and Whistler‐Mode Chorus to the Radiation Belt Variation During the May 2017 Storm (2021)
  • Author(s): Takahashi Naoko、Seki Kanako、Fok Mei‐Ching、Zheng Yihua、Miyoshi Yoshizumi、Kasahara Satoshi、Keika Kunihiro、Hartley David、Kasahara Yoshiya、Kasaba Yasumasa、Higashio Nana、Matsuoka Ayako、Yokota Shoichiro、Hori Tomoaki、Shoji Masafumi、Nakamura Satoko、Imajo Shun、Shinohara Iku
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 11
  • DOI: 10.1029/2020ja028972
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ULF wave transmission across collisionless shocks: 2.5D local hybrid simulations (2021)
  • Author(s): Kajdi, P., Pfau-Kempf, Y., Turc, L., Dimmock, A. P., Palmroth, M., Takahashi, K., et al.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 11
  • DOI: 10.1029/2021ja029283
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Study of an Equatorward Detachment of Auroral Arc From the Oval Using Ground‐Space Observations and the BATS‐R‐US-CIMI Model (2021)
  • Author(s): Yadav Sneha、Shiokawa K.、Oyama S.、et al.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 12
  • DOI: 10.1029/2020ja029080
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] On the relationship between energy input to the ionosphere and the ion outflow flux under different solar zenith angles (2021)
  • Author(s): Kitamura Naritoshi、Seki Kanako、Keika Kunihiro、Nishimura Yukitoshi、Hori Tomoaki、Hirahara Masafumi、Lund Eric J.、Kistler Lynn M.、Strangeway Robert J.
  • Journal Title: Earth, Planets and Space Volume: 73 Issue: 1
  • DOI: 10.1186/s40623-021-01532-y
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Role of Ducting in Relativistic Electron Loss by Whistler‐Mode Wave Scattering (2021)
  • Author(s): Artemyev A. V.、Demekhov A. G.、Zhang X.‐J.、Angelopoulos V.、Mourenas D.、Fedorenko Yu V.、Maninnen J.、Tsai E.、Wilkins C.、Kasahara S.、Miyoshi Y.、Matsuoka A.、Kasahara Y.、Mitani T.、Yokota S.、Keika K.、Hori T.、Matsuda S.、Nakamura S.、Kitahara M.、Takashima T.、Shinohara I.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 11
  • DOI: 10.1029/2021ja029851
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Magnetic Field and Energetic Particle Flux Oscillations and High‐Frequency Waves Deep in the Inner Magnetosphere During Substorm Dipolarization: ERG Observations (2021)
  • Author(s): Miyashita Yukinaga、Chang Tzu‐Fang、Miyoshi Yoshizumi、Hori Tomoaki、Kadokura Akira、Kasahara Satoshi et al.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 9
  • DOI: 10.1029/2020ja029095
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Field-aligned low-energy O+ flux enhancements in the inner magnetosphere observed by Arase (2021)
  • Author(s): Nose, M., A. Matsuoka, Y. Miyoshi, K. Asamura, T. Hori, M. Teramoto, I. Shinohara, and M. Hirahara
  • Journal Title: Journal of Geophysical Research Volume: 126 Issue: 8 Pages: 1-20
  • DOI: 10.1029/2021ja029168
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae (2021)
  • Author(s): Miyoshi Y.、Hosokawa K.、Kurita S.、Oyama S.-I.、Ogawa Y.、Saito S.、Shinohara I.、Kero A.、Turunen E.、Verronen P. T.、Kasahara S.、Yokota S.、Mitani T.、Takashima T.、Higashio N.、Kasahara Y.、Matsuda S.、Tsuchiya F.、Kumamoto A.、Matsuoka A.、Hori T.、Keika K.、Shoji M.、Teramoto M.、Imajo S.、Jun C.、Nakamura S.
  • Journal Title: Scientific Reports Volume: 11 Issue: 1 Pages: 13724-13724
  • DOI: 10.1038/s41598-021-92611-3
  • NAID: 120007142020
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Rocket Observation of Sub‐Relativistic Electrons in the Quiet Dayside Auroral Ionosphere (2021)
  • Author(s): Namekawa T.、Mitani T.、Asamura K.、Miyoshi Y.、Hosokawa K.、Ogawa Y.、Saito S.、Hori T.、Sugo S.、Kawashima O.、Kasahara S.、Nomura R.、Yagi N.、Fukizawa M.、Sakanoi T.、Saito Y.、Matsuoka A.、Shinohara I.、Fedorenko Y.、Nikitenko A.、Koehler C.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 7
  • DOI: 10.1029/2020ja028633
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Evening Side EMIC Waves and Related Proton Precipitation Induced by a Substorm (2021)
  • Author(s): Yahnin A. G.、Popova T. A.、Demekhov A. G.、Lubchich A. A.、Matsuoka A.、Asamura K.、Miyoshi Y.、Yokota S.、Kasahara S.、Keika K.、Hori T.、Tsuchiya F.、Kumamoto A.、Kasahara Y.、Shoji M.、Kasaba Y.、Nakamura S.、Shinohara I.、Kim H.、Noh S.、Raita T.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 7
  • DOI: 10.1029/2020ja029091
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Contribution of Electron Pressure to Ring Current and Ground Magnetic Depression Using RAM‐SCB Simulations and Arase Observations During 7?8 November 2017 Magnetic Storm (2021)
  • Author(s): Kumar S.、Miyoshi Y.、Jordanova V. K.、Engel M.、Asamura K.、Yokota S.、Kasahara S.、Kazama Y.、Wang S.‐Y.、Mitani T.、Keika K.、Hori T.、Jun C.、Shinohara I.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 6
  • DOI: 10.1029/2021ja029109
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Low-altitude ion upflow observed by EISCAT and its effects on supply of molecular ions in the ring current detected by Arase (ERG) (2021)
  • Author(s): Takada, M., Seki, K., Ogawa, Y., Keika, K., Kasahara, S., Yokota, S., et al.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 5
  • DOI: 10.1029/2020ja028951
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Multi‐Event Analysis of Plasma and Field Variations in Source of Stable Auroral Red (SAR) Arcs in Inner Magnetosphere During Non‐Storm‐Time Substorms (2021)
  • Author(s): Inaba, Y., K. Shiokawa, S.-I. Oyama, Y. Otsuka, M. Connors, I. Schofield, Y. Miyoshi, S. Imajo, A. Shinbori, Y. Gololobov, Y. Kazama, S. -Y. Wang, S. W. Y. Tam, T.-F. Chang, B. -J. Wang, K. Asamura, S. Yokota, S. Kasahara, K. Keika, T. Hori, A. Matsuoka, Y. Kasahara, A. Kumamoto, S. Matsuda, Y. Kasaba et al.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 4
  • DOI: 10.1029/2020ja029081
  • NAID: 120007175394
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] History of Japanese SuperDARN: Initiation of SENSU Syowa radars and progress of Japanese radar project (2021)
  • Author(s): Natsuo Sato, Tadahiko Ogawa, Hisao Yamagishi, Akira Sessai Yukimatu, Nozomu Nishitani, Takashi Kikuchi, Kenro Nozaki, Kiyoshi Igarashi, Tsutomu Nagatsuma
  • Journal Title: Polar Science Volume: - Pages: 100671-100671
  • DOI: 10.1016/j.polar.2021.100671
  • Peer Reviewed / Open Access
• [Journal Article] Energy‐Resolved Detection of Precipitating Electrons of 30-100 keV by a Sounding Rocket Associated With Dayside Chorus Waves (2021)
  • Author(s): Sugo S.、Kawashima O.、Kasahara S.、Asamura K.、Nomura R.、Miyoshi Y.、Ogawa Y.、Hosokawa K.、Mitani T.、Namekawa T.、Sakanoi T.、Fukizawa M.、Yagi N.、Fedorenko Y.、Nikitenko A.、Yokota S.、Keika K.、Hori T.、Koehler C.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 126 Issue: 3 Pages: 111-111
  • DOI: 10.1029/2020ja028477
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Active auroral arc powered by accelerated electrons from very high altitudes (2021)
  • Author(s): Imajo S.、Miyoshi Y.、Kazama Y.、Asamura K.、Shinohara I.、Shiokawa K.、Kasahara Y.、Kasaba Y.、Matsuoka A.、Wang S.-Y.、Tam S. W. Y.、Chang T.-F.、Wang B.-J.、Angelopoulos V.、Jun C.-W.、Shoji M.、Nakamura S.、Kitahara M.、Teramoto M.、Kurita S.、Hori T.
  • Journal Title: Scientific Reports Volume: 11 Issue: 1 Pages: 1610-1610
  • DOI: 10.1038/s41598-020-79665-5
  • NAID: 120006952779
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Propagation of ultralow‐frequency waves from the ion foreshock into the magnetosphere during the passage of a magnetic cloud. Journal of Geophysical Research: Space Physics (2021)
  • Author(s): Kazue Takahashi, Lucile Turc, Emilia Kilpua, Naoko Takahashi, Andrew Dimmock, Primoz Kajdic, Minna Palmroth, Yann Pfau‐Kempf, Jan Soucek, Tetsuo Motoba, Michael D. Hartinger, Anton Artemyev, Howard Singer, Urs Ganse, Markus Battarbee
  • Journal Title: Journal of Geophysical Research, Space Physics Volume: 126,2 Issue: 2
  • DOI: 10.1029/2020ja028474
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] On the Origin of Far‐Aspect Angle Irregularity Regions Seen by HF Radars at 100‐km Altitude (2020)
  • Author(s): J.‐P. St.‐Maurice, N. Nishitani
  • Journal Title: Journal of Geophysical Research, Space Physics Volume: 125, 6 Issue: 6
  • DOI: 10.1029/2019ja027473
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Dynamics of Auroral Precipitation Boundaries Associated With STEVE and SAID (2020)
  • Author(s): Y. Nishimura, E. F. Donovan, V. Angelopoulos, N. Nishitani
  • Journal Title: Journal of Geophysical Research, Space Physics Volume: 125, 8 Issue: 8
  • DOI: 10.1029/2020ja028067
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetospheric Conditions for STEVE and SAID: Particle Injection, Substorm Surge, and Field‐Aligned Currents (2020)
  • Author(s): Y. Nishimura, J. Yang, J. M. Weygand, W. Wang, B. Kosar, E. F. Donovan, V. Angelopoulos, L. J. Paxton, N. Nishitani
  • Journal Title: Journal of Geophysical Research, Space Physics Volume: 125, 8 Issue: 8
  • DOI: 10.1029/2020ja027782
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Dayside Polar Cap Density Enhancements Formed During Substorms (2020)
  • Author(s): L. V. Goodwin, Y. Nishimura, A. J. Coster, S. Zhang, N. Nishitani, J. M. Ruohoniemi, B. J. Anderson, Q.‐H. Zhang
  • Journal Title: Journal of Geophysical Research, Space Physics Volume: 125, 10 Issue: 10
  • DOI: 10.1029/2020ja028101
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Source Region and Propagation of Dayside Large‐Scale Traveling Ionospheric Disturbances (2020)
  • Author(s): Y. Nishimura, S. R. Zhang, L. R. Lyons, Y. Deng, A. J. Coster, J. I. Moen, L. B. Clausen, W. A. Bristow, N. Nishitani
  • Journal Title: Geophysical Research Letters Volume: 47, 19 Issue: 19
  • DOI: 10.1029/2020gl089451
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A framework for estimating spherical vector fields using localized basis functions and its application to SuperDARN data processing (2020)
  • Author(s): S. Nakano, T. Hori, K. Seki, and N. Nishitani
  • Journal Title: Earth, Planets and Space Volume: 72 Issue: 1 Pages: 46-46
  • DOI: 10.1186/s40623-020-01168-4
  • Peer Reviewed / Open Access
• [Journal Article] Temporal and spatial variations of total electron content enhancements during a geomagnetic storm on 27 and 28 September 2017 (2020)
  • Author(s): A. Shinbori, Y. Otsuka, T. Sori, T. Tsugawa, and M. Nishioka
  • Journal Title: Journal of Geophysical Research, Space Physics Volume: 125,7 Issue: 7
  • DOI: 10.1029/2019ja026873
  • NAID: 120006948920
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Plasma and Field Observations in the Magnetospheric Source Region of a Stable Auroral Red (SAR) Arc by the Arase Satellite on 28 March 2017 (2020)
  • Author(s): Inaba Y.、Shiokawa K,、Oyama S.、Otsuka Y.、Oksanen A.、Shinbori A.、Gololobov A. Y.、Miyoshi Y.、Kazama Y.、Wang S.‐Y.、Tam S. W. Y.、Chang T.‐F.、Wang B.‐J.、Yokota S.、Kasahara S.、Keika K.、Hori T.、Matsuoka A.、Kasahara Y.、Kumamoto A.、Kasaba Y.、Tsuchiya F.、Shoji Masafumi、Shinohara Iku、Stolle Claudia
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 125 Issue: 10 Pages: 118-118
  • DOI: 10.1029/2020ja028068
  • NAID: 120007146021
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Arase Observation of the Source Region of Auroral Arcs and Diffuse Auroras in the Inner Magnetosphere (2020)
  • Author(s): Shiokawa K.、Nos? M.、Imajo S.、Tanaka Y.‐M.、Miyoshi Y.、Hosokawa K.、Connors M.、Engebretson M.、Kazama Y.、Wang S.‐Y.、Tam S. W. Y.、Chang Tzu‐Fang、Wang Bo‐Jhou、Asamura K.、Kasahara S.、Yokota S.、Hori T.、Keika K.、Kasaba Y.、Shoji M.、Kasahara Y.、Matsuoka A.、Shinohara I.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 125 Issue: 8 Pages: 125-125
  • DOI: 10.1029/2019ja027310
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] xcitation of internally driven ULF waves by the drift‐bounce resonance with ring current ions based on the drift‐kinetic simulation (2020)
  • Author(s): Yamakawa, T., Seki, K., Amano, T., Takahashi, N., & Miyoshi, Y.
  • Journal Title: Journal of Geophysical Research, Space Physics Volume: 125,11 Issue: 11
  • DOI: 10.1029/2020ja028231
  • Peer Reviewed / Open Access
• [Journal Article] First observation of ionospheric convection from the Jiamusi HF radar during a strong geomagnetic storm (2020)
  • Author(s): Zhang, J. J., Wang, W., Wang, C., Lan, A. L., Yan, J. Y., Xiang, D., Zhang, Q.H., Ruohoniemi, J.M. , Kunduri, B.S.R, Nishitani, N., Shi, X., and Qiu, H.B.
  • Journal Title: Earth and Space Science Volume: 7 Issue: 1
  • DOI: 10.1029/2019ea000911
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Unprecedented Hemispheric Asymmetries During a Surprise Ionospheric Sltorm: A Game of Drivers (2020)
  • Author(s): Astafyeva, E., Bagiya, M. S., Foerster, M.,& Nishitani, N.
  • Journal Title: Journal of Geophysica Research: Space Physics Volume: 125 Issue: 3
  • DOI: 10.1029/2019ja027261
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Comparison of SuperDARN peak electron density estimates based on elevation angle measurements to ionosonde and incoherent scatter radar measurements (2020)
  • Author(s): Alexander V Koustov, Sydney Ullrich, Pavlo V. Ponomarenko, Robert G. Gillies, David R. Themens, and Nozomu Nishitani
  • Journal Title: Earth Planets Space Volume: 72 Issue: 1 Pages: 43-43
  • DOI: 10.1186/s40623-020-01170-w
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Characteristics of GNSS total clectron content enhancements over the midlatitudes during a geomagnetic storm on 7 and 8 November 2004 (2020)
  • Author(s): Sori, T., A. Shinbori, Y. Otsuka, T. Tsugawa, and M. Nishioka
  • Journal Title: J. Geophys. Res. Volume: 125 Issue: 12 Pages: 10376-10394
  • DOI: 10.1029/2019ja026713
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Response of the Ionosphere-Plasmasphere Coupling to the September 2017 Storm: What Erodes the Plasmasphere so Severely? (2019)
  • Author(s): Obana, Y., N. Maruyama, A. Shinbori, K. K. Hashimoto, M. Fedrizzi, M. Nose, Y. Otsuka, N. Nishitani, T. Hori, A. Kumamoto, F. Tsuchiya, S. Matsuda, A. Matsuoka, Y. Kasahara, A. Yoshikawa, Y. Miyoshi, and I. Shinohara
  • Journal Title: Space Weather Volume: 印刷中 Issue: 6 Pages: 1-1
  • DOI: 10.1029/2019sw002168
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Global diagnostics of ionospheric absorption during X‐ray solar flares based on 8‐20MHz noise measured by over‐the‐horizon radars (2019)
  • Author(s): Berngardt O.I.、Ruohoniemi J.M.、St‐Maurice J.‐P.、Marchaudon A.、Kosch M.J.、Yukimatu A.S.、Nishitani N.、Shepherd S.G.、Marcucci M.F.、Hu H.、Nagatsuma T.、Lester M.
  • Journal Title: Space Weather Volume: 17 Issue: 6 Pages: 1-18
  • DOI: 10.1029/2018sw002130
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Study of SuperDARN Response to Co-occurring Space Weather Phenomena (2019)
  • Author(s): Chakraborty, S., J.B.H. Baker, J.M. Ruohoniemi, B. Kunduri, N. Nishitani, and S.G. Shepherd
  • Journal Title: Space Weather Volume: 17 Issue: 9 Pages: 1351-1363
  • DOI: 10.1029/2019sw002179
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Occurrence of F region echoes for the polar cap SuperDARN radars (2019)
  • Author(s): Koustov, A.V., S. Ullrich, P.V. Ponomarenko, N. Nishitani, F.M. Marcucci, and W.A. Bristow
  • Journal Title: Earth Planets Space Volume: 71 Issue: 1 Pages: 112-112
  • DOI: 10.1186/s40623-019-1092-9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Meridional Distribution of Middle‐Energy Protons and Pressure‐Driven Currents in the Nightside Inner Magnetosphere: Arase Observations (2019)
  • Author(s): Imajo S.、Nos? M.、Kasahara S.、Yokota S.、Matsuoka A.、Keika K.、Hori T.、Teramoto M.、Yamamoto K.、Oimatsu S.、Nomura R.、Fujimoto A.、Shinohara I.、Miyoshi Y.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 124 Issue: 7 Pages: 5719-5733
  • DOI: 10.1029/2019ja026682
  • Peer Reviewed
• [Journal Article] Statistical Properties of Molecular Ions in the Ring Current Observed by the Arase (ERG) Satellite (2019)
  • Author(s): Seki K.、Keika K.、Kasahara S.、Yokota S.、Hori T.、Asamura K.、Higashio N.、Takada M.、Ogawa Y.、Matsuoka A.、Teramoto M.、Miyoshi Y.、Shinohara I.
  • Journal Title: Geophysical Research Letters Volume: 46 Issue: 15 Pages: 8643-8651
  • DOI: 10.1029/2019gl084163
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Strong Diffusion of Energetic Electrons by Equatorial Chorus Waves in the Midnight‐to‐Dawn Sector (2019)
  • Author(s): Kasahara S.、Miyoshi Y.、Kurita S.、Yokota S.、Keika K.、Hori T.、Kasahara Y.、Matsuda S.、Kumamoto A.、Matsuoka A.、Seki K.、Shinohara I.
  • Journal Title: Geophysical Research Letters Volume: 46 Issue: 22 Pages: 12685-12692
  • DOI: 10.1029/2019gl085499
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Remote Detection of Drift Resonance Between Energetic Electrons and Ultralow Frequency Waves: Multisatellite Coordinated Observation by Arase and Van Allen Probes (2019)
  • Author(s): Teramoto M.、Hori T.、Saito S.、Miyoshi Y.、Kurita S.、Higashio N.、Matsuoka A.、Kasahara Y.、Kasaba Y.、Takashima T.、Nomura R.、Nos? M.、Fujimoto A.、Tanaka Y.‐M.、Shoji M.、Tsugawa Y.、Shinohara M.、Shinohara I.、Blake J. B.、Fennell J.F.、Claudepierre S.G.、Turner D. L.、Kletzing C. A.、Sormakov D.、Troshichev O.
  • Journal Title: Geophysical Research Letters Volume: 46 Issue: 21 Pages: 11642-11651
  • DOI: 10.1029/2019gl084379
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cusp and Nightside Auroral Sources of O + in the Plasma Sheet (2019)
  • Author(s): Kistler L. M.、Mouikis C. G.、Asamura K.、Yokota S.、Kasahara S.、Miyoshi Y.、Keika K.、Matsuoka A.、Shinohara I.、Hori T.、Kitamura N.、Petrinec S. M.、Cohen I. J.、Delcourt D. C.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 124 Issue: 12 Pages: 10036-10047
  • DOI: 10.1029/2019ja027061
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars (2019)
  • Author(s): Nishitani, N. J.M. Ruohoniemi, M. Lester, J.B.H. Baker, A.V. Koustov, S.G. Shepherd, G. Chisham, T. Hori, E.G. Thomas, R.A. Makarevich, A. Marchaudon, P. Ponomarenko, J.A. Wild, S.E. Milan, W.A. Bristow, J. Devlin, E. Miller, R.A. Greenwald, T. Ogawa, and T. Kikuchi
  • Journal Title: Progress in Earth and Space Research Volume: 6:27 Issue: 1
  • DOI: 10.1186/s40645-019-0270-5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Local time extent of magnetopause reconnection using space-ground coordination (2019)
  • Author(s): Ying Zou, Brian M. Walsh, Yukitoshi Nishimura, Vassilis Angelopoulos, J. Michael Ruohoniemi, Kathryn A. McWilliams, and Nozomu Nishitani
  • Journal Title: Annales Geophysicae Volume: 印刷中 Issue: 2 Pages: 215-234
  • DOI: 10.5194/angeo-37-215-2019
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ERG observations of drift echoes during a unique period of the satellite mission (2019)
  • Author(s): Chang, T.-F., C.-Z. Cheng, S. W. Tam, C.-Y. Chiang, Y. Miyoshi, T. Hori, T. Mitani, T. Takashima, A. Matsuoka, M. Teramoto, and I. Shinohara
  • Journal Title: Earth, Planets and Space Volume: 71:18 Issue: 1
  • DOI: 10.1186/s40623-019-0999-5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Transient ionization of the mesosphere during auroral breakup: Arase satellite and ground-based conjugate observations at Syowa Station (2019)
  • Author(s): Kataoka, R., T. Nishiyama, Y. Tanaka, A. Kadokura, H. A. Uchida, Y. Ebihara, M. Ejiri, Y. Tomikawa, M. Tsutsumi, K. Sato, Y. Miyoshi, K. Shiokawa, S. Kurita, Y. Kasahara, M. Ozaki, K. Hosokawa, S. Matsuda, I. Shinohara, T. Takashima, T. Sato, T. Mitani, T. Hori, and N. Higashio
  • Journal Title: Earth, Planets and Space Volume: 71:9 Issue: 1 Pages: 1-10
  • DOI: 10.1186/s40623-019-0989-7
  • NAID: 120006554807
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] SuperDARN北海道-陸別第一・第二HFレーダー2022年度報告 (2023)
  • Author(s): 西谷 望
  • Organizer: 陸別ユーザーズミーティング
• [Presentation] 現象報告期間(2022.09-2023.03)におけるHOP radars/SuperDARN観測報告 (2023)
  • Author(s): 西谷望・堀智昭・SuperDARN PIs
  • Organizer: 第二回STE現象報告会
• [Presentation] SuperDARN Hokkaido Pair of (HOP) radars - studying the ionosphere, thermosphere and upper atmosphere in the Arctic region (2023)
  • Author(s): N. Nishitani
  • Organizer: ISAR-7
  • Int'l Joint Research
• [Presentation] SKA電波干渉計による太陽地球系科学研究の可能性 (2023)
  • Author(s): 西谷 望
  • Organizer: SKA-Japanワークショップ
  • Invited
• [Presentation] Current status of the SuperDARN Hokkaido Pair of radars (2023)
  • Author(s): 西谷 望
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN 北海道-陸別第一・第二レーダーで観測されたSAPS の緯度特性 (2023)
  • Author(s): 西谷望・堀智昭
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN で観測されたPc5 帯ULF 波動の振動方向・m-number 特性の研究 (2023)
  • Author(s): Koki Morita, Nozomu Nishitani, Tomoaki Hori, Kazuhiro Yamamoto, Simon G. Shepherd, Pasha Ponomarenko
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] The cause of the mid-latitude ionospheric plasma flow during storm recovery phase observed by the SuperDARN Hokkaido East Radar compared to AMPERE and TIEGCM data (2023)
  • Author(s): K. Omori, N. Nishitani, T. Hori, Gangu Lu, Brian J. Anderson, Sarah K Vines
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN 北海道-陸別第一・第二HF レーダーと全球GNSS-TEC 観測から捉えたトンガ火山大規模噴火後の電離圏擾乱の特徴とその発生機構について (2023)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Michi Nishioka, Septi Perwitasari, Takuo Tsuda, and Nozomu Nishitani
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN 北海道-陸別第一HF レーダーを用いた中緯度電離圏F 領域エコー発生分布の 統計解析 (2023)
  • Author(s): Itsuki Furuhashi, Nozomu Nishitani, and Tomoaki Hori
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SAPS electric field and particle boundaries as observed by SuperDARN and Arase (2023)
  • Author(s): T. Hori, Y. Miyoshi, S. Nakamura, Y. Kasaba, T. Nakagawa, M. Kitahara, S. Matsuda, N. Nishitani, S. G. Shepherd, J. M. Ruohoniemi, A. Kumamoto, F. Tsuchiya, Y. Kasahara, K. Asamura, C.-W. Jun, Y. Kazama, S.-Y. Wang, S. W. Y. Tam, K. Keika, S. Kasahara, S. Yokota, A. Matsuoka, and I. Shinohara
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] Generation Mechanism of Ionospheric Disturbances after the 2022 Hunga Tonga-Hunga Ha’Apai Volcanic Eruption (2023)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Michi Nishioka, Septi Perwitasari, Takuo Tsuda, and Nozomu Nishitani
  • Organizer: AMS2023
  • Int'l Joint Research
• [Presentation] SuperDARN北海道-陸別第一・第二HFレーダーと全球GNSS-TEC観測によるトンガ火山大規模噴火後の電離圏擾乱の特徴について (2023)
  • Author(s): 新堀 淳樹、大塚 雄一、惣宇利 卓弥、西岡 未知、Perwitasari Septi、津田 卓雄、西谷 望
  • Organizer: 2023陸別・母子里ユーザーズミーティング
• [Presentation] 陸別のHFレーダー他で観測された磁気流体波動の振動方向・波数分布特性の結果報告 (2023)
  • Author(s): Koki Morita, Nozomu Nishitani, Tomoaki Hori, Kazuhiro Yamamoto, Simon G. Shepherd
  • Organizer: 陸別ユーザーズミーティング
• [Presentation] Relative contribution of waves to the radiation belt variation during the May 2017 storm: Arase, Van Allen Probes, and global MHD simulation (2023)
  • Author(s): Naoko Takahashi, Kanako Seki, Mei-Ching Fok, Yihua Zheng, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, David Hartley, Yoshiya Kasahara, Yasumasa Kasaba, Nana Higashio, Ayako Matsuoka, Shoichiro Yokota, Tomoaki Hori, Masafumi Shoji, Satoko Nakamura, Shun Imajo, Iku Shinohara
  • Organizer: RBSP online seminar
  • Int'l Joint Research / Invited
• [Presentation] Effects of the dynamics of cold plasma on the excitation of internally driven ULF waves by ring current ions based on the magnetosphere-ionosphere coupled model (2023)
  • Author(s): 山川 智嗣、関 華奈子、天野 孝伸、三好 由純、高橋 直子、中溝 葵、山本和弘
  • Organizer: あらせサイエンス会議
• [Presentation] Excitation of internally driven ULF waves by ring current ions based on the magnetosphere-ionosphere coupled model (2023)
  • Author(s): 山川 智嗣、関 華奈子、天野 孝伸、三好 由純、高橋 直子、中溝 葵、山本和弘
  • Organizer: ISEE研究集会「太陽地球圏環境予測のためのモデル研究の展望」
  • Invited
• [Presentation] Hokkaido Pair of (HOP) radars and SuperDARN: overview, latest achievements and future perspectives (2022)
  • Author(s): Nozumu Nishitani
  • Organizer: The 5th ISEE Symposium: Toward the Future of Space and Earth Environmental Research
  • Int'l Joint Research
• [Presentation] SuperDARN HOP radars observation of sub-auroral flows associated with Stable Auroral Red (SAR) Arc structure during the 4 Nov 2021 storm event (2022)
  • Author(s): N. Nishitani, T. Hori, K. Shiokawa, Y. Otsuka, Boris Shevtsov, Sergey Khomotov
  • Organizer: SuperDARN Workshop 2022
  • Int'l Joint Research
• [Presentation] Ionospheric outflow associated with SAPS observed by Arase and SuperDARNIonospheric outflow associated with SAPS observed by Arase and SuperDARN (2022)
  • Author(s): Tomoya Takada, Nozomu Nishitani, Tomoaki Hori, Simon G. Shepherd , et al.
  • Organizer: SuperDARN Workshop 2022
  • Int'l Joint Research
• [Presentation] Mode and m-number analysis of Pc5 waves observed by the SuperDARN Hokkaido East rada (2022)
  • Author(s): Koki Morita, N. Nishitani, T. Hori
  • Organizer: SuperDARN Workshop 2022
  • Int'l Joint Research
• [Presentation] Mid-latitude SuperDARN - overview, latest achievements and future perspectives (2022)
  • Author(s): Nozomu Nishitani, Tomoaki Hori, Akira Sessai Yukimatu
  • Organizer: JPGU 2023
  • Int'l Joint Research
• [Presentation] SuperDARN observation of sub-auroral flows associated with Stable Auroral Red Arc structure during the 4 Nov 2021 storm event (2022)
  • Author(s): N. Nishitani, T. Hori, K. Shiokawa, Y. Otsuka, Boris Shevtsov, Sergey Khomotov
  • Organizer: JPGU 2023
  • Int'l Joint Research
• [Presentation] 現象報告期間(2022.03-2022.09)におけるHOP radars/SuperDARN観測報告 (2022)
  • Author(s): 西谷 望、堀 智昭、SuperDARN PIs
  • Organizer: 第一回STE現象報告会
• [Presentation] SuperDARN北海道- 陸別第一・第二レーダーで観測されたSAPS構造の緯度分布について (2022)
  • Author(s): 西谷 望、堀 智昭
  • Organizer: 第152回 地球電磁気・地球惑星圏学会講演会
• [Presentation] SuperDARNネットワークのデータ管理体制の現状と課題 (2022)
  • Author(s): 西谷 望、行松 彰、堀 智昭
  • Organizer: 第152回 地球電磁気・地球惑星圏学会講演会
  • Invited
• [Presentation] Latitudinal distribution of the SAPS structure observed by the SuperDARN Hokkaido Pair of radars (2022)
  • Author(s): N. Nishitani, T. Hori
  • Organizer: AGU Fall meeting
  • Int'l Joint Research
• [Presentation] Mode and m-number analysis of ULF waves in the Pc5 frequency range observed by the SuperDARN Hokkaido East radar (2022)
  • Author(s): Morita, K., Nishitani, N., and Hori, T.
  • Organizer: Japan Geoscience Union Meeting 2022
  • Int'l Joint Research
• [Presentation] Identification of primary mode and m-number of Pc5 waves observed by SuperDARN radars (2022)
  • Author(s): Morita, K., Nishitani, N., Hori, T., and Shepherd, S.G.
  • Organizer: AGU Fall meeting
  • Int'l Joint Research
• [Presentation] SuperDARNレーダーで観測されたPc5帯ULF波動のモードおよびm-number解析 (2022)
  • Author(s): 森田洸生、西谷望、堀智昭、SuperDARN PIs
  • Organizer: 第152回 地球電磁気・地球惑星圏学会講演会
• [Presentation] SuperDARN で観測された ULF 波動のモード・m-number の Lomb-Scargle 法による統計解析 (2022)
  • Author(s): 森田洸生、西谷望、堀智昭、SuperDARN PIs
  • Organizer: 太陽地球系物理学分野のデータ解析手法・ツールの理解と応用
• [Presentation] SuperDARNレーダーデータによる磁気嵐発生時の中緯度電離圏対流の解析 (2022)
  • Author(s): 大森康平、西谷望、堀智昭
  • Organizer: 第152回 地球電磁気・地球惑星圏学会講演会
• [Presentation] Study of mid-latitude ionospheric convection characteristics during geomagnetic storms using Superposed Epoch Analysis with SuperDARN radars data (2022)
  • Author(s): Kohei Omori, Nozomu Nishitani, Tomoaki Hori, Simon G. Shepherd
  • Organizer: AGU fall Meeting
  • Int'l Joint Research
• [Presentation] GNSS-TECとSuperDARN北海道レーダー観測による2022年フンガトンガ・フンガハアパイ火山噴火後の電離圏擾乱の電磁気的共役性について (2022)
  • Author(s): 新堀 淳樹、大塚 雄一、惣宇利 卓弥、西岡 未知、Perwitasari Septi、津田 卓雄、西谷 望
  • Organizer: 日本地球惑星科学連合
• [Presentation] 地上全天カメラとあらせ衛星・Van Allen Probes衛星によるサブオーロラ帯の３種類のオーロラ同時観測の複数例解析 (2022)
  • Author(s): 椙村 怜、塩川 和夫、大塚 雄一、大山 伸一郎、Martin Connors、門倉 昭、Poddelsky Alexey、Poddelsky Igor、 Shevtsov Boris、三好 由純、篠原 育、土屋 史紀、笠原 禎也、熊本 篤志、中村 紗都子、新堀 淳樹、 et al.
  • Organizer: 日本地球惑星科学連合
• [Presentation] Statistical behavior of large-scale ionospheric disturbances from high latitudes to mid-latitudes during geomagnetic storms using 20-year GNSS-TEC data: Dependence on season and storm intensity (2022)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Takuya Tsugawa, and Michi Nishioka
  • Organizer: JPGU 2023
  • Int'l Joint Research
• [Presentation] GNSS-TECとSuperDARN北海道レーダーによって観測された2022年フンガトンガ・フンガハアパイ火山噴火後の電離圏擾乱の電磁気的共役性について (2022)
  • Author(s): 新堀 淳樹、大塚 雄一、惣宇利 卓弥、西岡 未知、Perwitasari Septi、津田 卓雄、西谷 望
  • Organizer: 測位航法学会2022
• [Presentation] Generation mechanism of ionospheric disturbances after the 2022 Hunga Tonga-Hunga Ha’apai volcanic eruption (2022)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Michi Nishioka, Septi Perwitasari, Takuo Tsuda, and Nozomu Nishitani
  • Organizer: URSI-JRSM
  • Int'l Joint Research
• [Presentation] Electromagnetic conjugacy of ionospheric disturbances after the 2022 Hunga Tonga-Hunga Ha’apai volcanic eruption observed by GNSS-TEC and SuperDARN Hokkaido pair of radars (2022)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Michi Nishioka, Septi Perwitasari, Takuo Tsuda, and Nozomu Nishitani
  • Organizer: ISEA-16
  • Int'l Joint Research
• [Presentation] SPEDAS用OMTIデータ解析ツールの開発 (2022)
  • Author(s): 新堀淳樹、塩川和夫、大塚雄一
  • Organizer: 第17回ERGサイエンス会議
• [Presentation] SPEDAS用OMTIデータ解析ツールの開発 (2022)
  • Author(s): 新堀淳樹、塩川和夫、大塚雄一
  • Organizer: MTI 研究集会
• [Presentation] GNSS-TECとSuperDARN北海道レーダー観測データを用いた2022年1月15日のトンガ火山噴火後に見られた電離圏擾乱の特徴について (2022)
  • Author(s): 新堀 淳樹、大塚 雄一、惣宇利 卓弥、西岡 未知、Perwitasari Septi、津田 卓雄、西谷 望
  • Organizer: 地球電磁気・地球惑星圏学会
• [Presentation] Generation mechanism of ionospheric disturbances after the 2022 Hunga Tonga-Hunga Ha’apai volcanic eruption using GNSS-TEC and SuperDARN Hokkaido pair of radars observation data (2022)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Michi Nishioka, Septi Perwitasari, Takuo Tsuda, and Nozomu Nishitani
  • Organizer: AGU2022
  • Int'l Joint Research
• [Presentation] Spatial relationship of SAPS and particle boundaries as observed by Arase (2022)
  • Author(s): T. Hori, Y. Miyoshi, S. Nakamura, Y. Kasaba, T. Nakagawa, M. Kitahara, S. Matsuda, N. Nishitani, A. Kumamoto, F. Tsuchiya, Y. Kasahara, K. Asamura, C.-W. Jun, Y. Kazama, S.-Y. Wang, K. Keika, S. Kasahara, S. Yokota, A. Matsuoka, I. Shinohara
  • Organizer: JPGU 2022
  • Int'l Joint Research
• [Presentation] Spatial relationship of SAPS and particle boundaries as observed by Arase (2022)
  • Author(s): T. Hori, Y. Miyoshi, S. Nakamura, Y. Kasaba, T. Nakagawa, M. Kitahara, S. Matsuda, N. Nishitani, A. Kumamoto, F. Tsuchiya, Y. Kasahara, K. Asamura, C.-W. Jun, Y. Kazama, S.-Y. Wang, K. Keika, S. Kasahara, S. Yokota, A. Matsuoka, I. Shinohara
  • Organizer: SuperDARN Workshop 2022
  • Int'l Joint Research
• [Presentation] SAPS electric field and particle boundaries in the equatorial magnetosphere as observed by Arase (2022)
  • Author(s): T. Hori, Y. Miyoshi, S. Nakamura, Y. Kasaba, T. Nakagawa, M. Kitahara, S. Matsuda, N. Nishitani, A. Kumamoto, F. Tsuchiya, Y. Kasahara, K. Asamura, C.-W. Jun, Y. Kazama, S.-Y. Wang, K. Keika, S. Kasahara, S. Yokota, A. Matsuoka, I. Shinohara
  • Organizer: SGEPSS 2022
• [Presentation] Prediction of Dst index Using Burton's Model and SUSANOO-CME for Space Weather Forecast (2022)
  • Author(s): 高橋 直子、中溝 葵、坂口 歌織、塩田 大幸
  • Organizer: 日本地球惑星科学連合
  • Int'l Joint Research
• [Presentation] Excitation of two types of storm-time Pc5 ULF waves based on the magnetosphere-ionosphere coupled model (2022)
  • Author(s): 山川 智嗣、関 華奈子、天野 孝伸、三好 由純、高橋 直子、中溝 葵
  • Organizer: JPGU 2022
  • Int'l Joint Research
• [Presentation] Excitation of two types of storm-time Pc5 ULF waves based on the magnetosphere-ionosphere coupled model (2022)
  • Author(s): Tomotsugu Yamakawa, Kanako Seki, Takanobu Amano, Yoshizumi Miyoshi, Naoko Takahashi, and Aoi Nakamizo
  • Organizer: AT-AP-RASC2022
  • Int'l Joint Research
• [Presentation] Control of the dynamics of cold particles on the excitation of ULF waves based on the magnetosphere-ionosphere coupled model (2022)
  • Author(s): 山川 智嗣、関 華奈子、天野 孝伸、三好 由純、高橋 直子、中溝 葵
  • Organizer: あらせサイエンス会議
• [Presentation] Forecast of Geomagnetic Field Disturbances Using the Empirical Model for Space Weather (2022)
  • Author(s): 高橋 直子, 中溝 葵, 坂口 歌織, 塩田 大幸
  • Organizer: 地球電磁気・地球惑星圏学会
• [Presentation] Control of the dynamics of cold particles on the excitation of ULF waves based on the magnetosphere-ionosphere coupled model (2022)
  • Author(s): Tomotsugu Yamakawa, Kanako Seki, Takanobu Amano, Yoshizumi Miyoshi, Naoko Takahashi, Aoi Nakamizo, Kazuhiro Yamamoto
  • Organizer: 地球電磁気・地球惑星圏学会
• [Presentation] (中緯度)SuperDARNの現状と今後の計画 (2022)
  • Author(s): 西谷 望・堀 智昭・行松 彰・SuperDARN PIs
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN HOPレーダーによる2021年11月の磁気嵐時に発生したSAR arcに関連した電離圏プラズマフローの観測 (2022)
  • Author(s): N. Nishitani, T. Hori, K. Shiokawa, Y. Otsuka, Boris Shevtsov, Sergey Khomotov
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARNとあらせ衛星によるSAPSに伴う電離圏アウトフローの観測 (2022)
  • Author(s): "高田知弥、西谷望、堀智昭、Simon G. Shepherd 、笠羽康正、熊本篤志、加藤雄人 、笠原禎也、小路真史、中村紗都子、北原理弘、土屋史紀、浅村和史、三好由純、風間洋一、 S.-Y. Wang 、C.-W. Jun 、横田勝一郎、笠原慧、桂華邦裕、松岡彩子、今城峻、新堀淳樹、篠原育"
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] 中緯度SuperDARNレーダーを用いたMSTID特性についての統計解析 (2022)
  • Author(s): 枦山航、西谷望、堀智昭、中村卓司、Septi Perwitasari
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARNで観測されたPc5帯ULF波動のモード解析 (2022)
  • Author(s): 森田洸生、西谷望、堀智昭
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN北海道陸別第一レーダーによって磁気嵐の回復相に観測された西向きフローの成因に関するイベント解析 (2022)
  • Author(s): 大森康平、西谷望、堀智昭
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] 現象報告期間(2021.09-2022.03)におけるHOP radars/SuperDARN観測報告 (2022)
  • Author(s): 西谷 望・堀 智昭・SuperDARN PIs
  • Organizer: 第二回STE現象報告会
• [Presentation] SuperDARN北海道-陸別第一・第二HFレーダー2021年度報告 (2022)
  • Author(s): 西谷 望
  • Organizer: 陸別ユーザーズミーティング
• [Presentation] Statistical behavior of global electron density variations in the ionosphere during geomagnetic storms using 20-year GNSS-TEC data (2022)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Sori Takuya, Takuya Tsugawa, and Michi Nishioka
  • Organizer: STP-15
  • Int'l Joint Research
• [Presentation] 2022年1月14-16日の磁気嵐とトンガ火山噴火に伴う電離圏変動について (2022)
  • Author(s): 新堀淳樹、大塚雄一、惣宇利卓弥、西岡未知、 Perwitasari Septi、津田卓雄、西谷望
  • Organizer: 令和3年度第2回STE現象報告会
• [Presentation] 衛星・地上観測によるトンガ火山噴火に伴う電離圏擾乱(プラズマバブル)とその発生機構について (2022)
  • Author(s): 新堀淳樹、大塚雄一、惣宇利卓弥、西岡未知、Perwitasari Septi、津田卓雄、西谷望、熊本篤志、土屋史紀、松田昇也、笠原禎也、松岡彩子、中村紗都子、三好由純
  • Organizer: 第16回ERGサイエンス会議
• [Presentation] Excitation of two types of storm-time Pc5 ULF waves by ring current ions based on the magnetosphere-ionosphere coupled model (2022)
  • Author(s): 山川智嗣、関華奈子、天野孝伸、三好由純、高橋直子、中溝葵
  • Organizer: 第16回ERGサイエンス会議
• [Presentation] Spatial relationship of SAPS and particle boundaries as observed by Arase (2022)
  • Author(s): T. Hori, Y. Miyoshi, S. Nakamura, Y. Kasaba, T. Nakagawa, M. Kitahara, S. Matsuda, N. Nishitani, A. Kumamoto, F. Tsuchiya, Y. Kasahara, K. Asamura, C.-W. Jun1, Y. Kazama, S.-Y. Wang, K. Keika, S. Kasahara, S. Yokota, A. Matsuoka, I. Shinohara
  • Organizer: 2021年度極域・中緯度SuperDARN研究集会
• [Presentation] The magnetospheric counterpart of subauroral polarization streams (SAPS) as observed by Arase (2022)
  • Author(s): T. Hori, Y. Miyoshi, S. Nakamura, Y. Kasaba, T. Nakagawa, M. Kitahara, S. Matsuda, N. Nishitani, A. Kumamoto, F. Tsuchiya, Y. Kasahara, K. Asamura, C.-W. Jun1, Y. Kazama, S.-Y. Wang, K. Keika, S. Kasahara, S. Yokota, A. Matsuoka, I. Shinohara
  • Organizer: 第16回ERGサイエンス会議
• [Presentation] Statistical analysis of local time dependence of MSTID characteristics using the SuparDARN pair of radars (2021)
  • Author(s): 枦山 航、西谷 望、堀 智昭
  • Organizer: Japan Geoscience Union Meeting 2021
  • Int'l Joint Research
• [Presentation] Development of the imaging receiver system for the SuperDARN Hokkaido East radar (2021)
  • Author(s): 西谷 望、堀 智昭、濱口 佳之
  • Organizer: Japan Geoscience Union Meeting 2021
  • Int'l Joint Research
• [Presentation] SuperDARN: Recent progress and future perspectives (2021)
  • Author(s): 西谷 望、行松 彰、堀 智昭
  • Organizer: Japan Geoscience Union Meeting 2021
  • Int'l Joint Research
• [Presentation] SAPS electric field and particle observations by the Arase satellite and SuperDARN (2021)
  • Author(s): 高田 知弥、西谷 望、堀 智昭、笠羽 康正、熊本 篤志、加藤 雄人、笠原 禎也、小路 真史、中村 紗都子、北原 理弘、土屋 史紀、浅村 和史、三好 由純、風間 洋一、Wang S、横田 勝一郎、笠原 慧、桂華 邦裕、松岡 彩子、今城 峻、篠原 育、Jun Chae-Woo、Shepherd Simon
  • Organizer: Japan Geoscience Union Meeting 2021
  • Int'l Joint Research
• [Presentation] Seasonal and longitudinal dependence of the Sub-Auroral Polarization Streams occurrence observed by the SuperDARN radars (2021)
  • Author(s): 大矢 健斗、*西谷 望、堀 智昭、Ruohoniemi Mike、Bristow William、Shepherd Simon、Kunduri Bharat
  • Organizer: Japan Geoscience Union Meeting 2021
  • Int'l Joint Research
• [Presentation] "Mode identification of MHD waves observed by the SuperDARN radars using the Lomb-Scargle analysis SuperDARNレーダーで観測されたMHD波動のLomb-Scargle解析による モード特定" (2021)
  • Author(s): 森田 洸生、西谷 望、堀 智昭
  • Organizer: Japan Geoscience Union Meeting 2021
  • Int'l Joint Research
• [Presentation] SuperDARNネットワークのデータマネージメントの現状と課題 (2021)
  • Author(s): 西谷 望, 行松 彰, 堀 智昭
  • Organizer: 地球電磁気・地球惑星圏学会 第150回総会・講演会
• [Presentation] Lomb-Scargle periodogram analysis of Pc5 waves observed by the SuperDARN Hokkaido East Radar and ground-based magnetometers (2021)
  • Author(s): 森田 洸生，西谷 望，堀 智昭
  • Organizer: 地球電磁気・地球惑星圏学会 第150回総会・講演会
• [Presentation] SuperDARN北海道-陸別第一レーダーのイメージング化計画 (2021)
  • Author(s): 西谷 望、堀 智昭、濱口 佳之
  • Organizer: 地球電磁気・地球惑星圏学会 第150回総会・講演会
• [Presentation] SuperDARNレーダーとあらせ衛星によるSAPSに伴う電離圏粒子流出の観測 (2021)
  • Author(s): 高田知弥, 西谷望, 堀智昭,Shepherd Simon G., 笠羽康正, 熊本篤志, 加藤雄人, 笠原禎也, 小路真史, 中村紗都子, 北原理弘, 土屋史紀, 風間洋一, 浅村和史, 三好由純, 横田勝一郎, 笠原慧,桂華邦裕, 松岡彩子, 今城峻, 篠原育
  • Organizer: 地球電磁気・地球惑星圏学会 第150回総会・講演会
• [Presentation] Statistical analysis of nighttime MSTIDs characteristics using the mid-latitude SuperDARN radars (2021)
  • Author(s): Wataru Hazeyama,Nozomu Nishitani,Tomoaki Hori,Takuji Nakamura,SEPTI PERWITASARI
  • Organizer: 地球電磁気・地球惑星圏学会 第150回総会・講演会
• [Presentation] Development of the imaging receiver system with USRP units for the SuperDARN Hokkaido East radar (2021)
  • Author(s): Nozomu Nishitani, Yoshiyuki Hamaguchi, Tomoaki Hori
  • Organizer: SuperDARN 2021 Workshop
  • Int'l Joint Research
• [Presentation] Statistical analysis of mid-latitude MSTID characteristics using the SuperDARN Hokkaido pair of radars (2021)
  • Author(s): Wataru Hazeyama, Nozomu Nishitani, Tomoaki Hori
  • Organizer: SuperDARN 2021 Workshop
  • Int'l Joint Research
• [Presentation] Mode analysis of Pc5 waves observed by the SuperDARN Hokkaido East radar using the Lomb-Scargle frequency analysis (2021)
  • Author(s): Morita, K., N. Nishitani, and T. Hori
  • Organizer: SuperDARN 2021 Workshop
  • Int'l Joint Research
• [Presentation] Review of Mid-latitude SuperDARN and Prospect of SuperDARN Field of View Expansion to Lower Latitudes (2021)
  • Author(s): Nozomu Nishitani
  • Organizer: AOGS 18th Annual Meeting (AOGS2021)
  • Int'l Joint Research
• [Presentation] 現象報告期間(2021.03-2021.09)におけるHOP radars/SuperDARN観測報告 (2021)
  • Author(s): 西谷 望、堀 智昭、大森康平、SuperDARN PIs
  • Organizer: 2021年度第1回STE現象報告会
• [Presentation] 大磁気嵐時における大規模電離圏対流の特性について (2021)
  • Author(s): 大森康平、西谷望、堀智昭、SuperDARN Pls
  • Organizer: 2021年度第1回STE現象報告会
• [Presentation] Statistical analysis of seasonal and solar activity dependences of nighttime MSTIDs using the mid-latitude SuperDARN radars (2021)
  • Author(s): Wataru Hazeyama, Nozomu Nishitani, Tomoaki Hori, Takuji Nakamura, Septi Perwitasari
  • Organizer: MTI研究集会
• [Presentation] Outflow of ionospheric ions associated with SAPS observed by SuperDARN, Arase, and DMSP satellites (2021)
  • Author(s): Takada., N. Nishitani, T. Hori, S. G. Shepherd, K. Asamura, A. Kumamoto, Y. Katoh, Y. Kasahara, M. Shoji, S. Nakamura, M. Kitahara, F. Tsuchiya, Y. Kasaba, Y. Miyoshi, Y. Kazama, S.-Y. Wang, C.-W. Jun, S. Yokota, S. Kasahara, K. Keika, A. Matsuoka, S. Imajo, I. Shinohara, A. Shinbori
  • Organizer: 第15回ERGサイエンス会議
• [Presentation] Plan and progress report on the imaging receiver system at the SuperDARN Hokkaido East radar (2021)
  • Author(s): Nozomu Nishitani
  • Organizer: The 12th Symposium on Polar Science
  • Int'l Joint Research
• [Presentation] Clarifying the cross-scale coupling of the SAPS and their internal structure using the SuperDARN Hokkaido East / West radars (2021)
  • Author(s): Nozomu Nishitani, Tomoaki Hori, Yoshiyuki Hamaguchi
  • Organizer: AGU Fall Meeting 2021
  • Int'l Joint Research
• [Presentation] Ionospheric outflow associated with SAPS observed by SuperDARN and Arase (2021)
  • Author(s): Takada., N. Nishitani, T. Hori, S. G. Shepherd, K. Asamura, A. Kumamoto, Y. Katoh, Y. Kasahara, M. Shoji, S. Nakamura, M. Kitahara, F. Tsuchiya, Y. Kasaba, Y. Miyoshi, Y. Kazama, S.-Y. Wang, C.-W. Jun, S. Yokota, S. Kasahara, K. Keika, A. Matsuoka, S. Imajo, I. Shinohara, A. Shinbori
  • Organizer: AGU Fall Meeting 2021
  • Int'l Joint Research
• [Presentation] Seasonal and solar activity dependences of nighttime MSTIDs using the mid-latitude SuperDARN radars data (2021)
  • Author(s): Wataru Hazeyama, Nozomu Nishitani, Tomoaki Hori, Takuji Nakamura, Septi Perwitasari
  • Organizer: AGU Fall Meeting 2021
  • Int'l Joint Research
• [Presentation] Lomb-Scargle periodogram analysis of Pc5 ULF waves using the SuperDARN Hokkaido East Radar and ground-based magnetometers data (2021)
  • Author(s): Morita, K., N. Nishitani and T. Hori
  • Organizer: AGU Fall Meeting 2021
  • Int'l Joint Research
• [Presentation] Statistical behavior of large-scale ionospheric disturbances during geomagnetic storms using 20-years GNSS-TEC data (2021)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Sori Takuya, Takuya Tsugawa, and Michi Nishioka
  • Organizer: Japan Geoscience Union 2021
  • Int'l Joint Research
• [Presentation] Statistical Behavior of Large-scale Ionospheric Disturbances During Geomagnetic Storms Using 20-years GNSS-TEC Data (2021)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Sori Takuya, Takuya Tsugawa, and Michi Nishioka
  • Organizer: Asia Oceania Geosciences Society (AOGS) 2021
  • Int'l Joint Research
• [Presentation] Statistical behavior of large-scale ionospheric disturbances during geomagnetic storms using 20-year GNSS-TEC data (2021)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Sori Takuya, Takuya Tsugawa, and Michi Nishioka
  • Organizer: AGU Fall Meeting 2021
  • Int'l Joint Research
• [Presentation] 中間圏・熱圏・電離圏(MTI)分科会における2030年代までのMTI結合過程の理解に向けた将来構想 (2021)
  • Author(s): 新堀淳樹、藤本晶子、穂積 Kornyanat、中田裕之、西岡未知、冨川喜弘、津田卓雄
  • Organizer: 第150回 地球電磁気・地球惑星圏学会 総会・講演会
  • Invited
• [Presentation] 長期GNSS-TECデータに見られる磁気嵐時の全球的な電離圏電子密度の時間・空間変動について (2021)
  • Author(s): 新堀淳樹、大塚雄一、惣宇利卓弥、津川卓也、西岡未知
  • Organizer: MTI 研究集会
• [Presentation] 20年間のGNSS-TECデータに見られるCIR/CME駆動型磁気嵐時の大規模電離圏擾乱の統計的振る舞い (2021)
  • Author(s): 新堀淳樹、大塚雄一、惣宇利卓弥、津川卓也、西岡未知
  • Organizer: 第150回 地球電磁気・地球惑星圏学会 総会・講演会
• [Presentation] Relative Contribution of ULF waves and Whistler-mode Chorus to the Radiation Belt Variation During the May 2017 Storm (2021)
  • Author(s): Naoko Takahashi, Kanako Seki, Mei-Ching Fok, Yihua Zheng, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, David Hartley, Yoshiya Kasahara, Yasumasa Kasaba, Nana Higashio, Ayako Matsuoka, Shoichiro Yokota, Tomoaki Hori, Masafumi Shoji, Satoko Nakamura, Shun Imajo, Iku Shinohara
  • Organizer: Japan Geoscience Union 2021
  • Int'l Joint Research
• [Presentation] Study of the excitation mechanism of internally driven ULF waves by the drift-bounce resonance with ring current ions based on the Magnetosphere-Ionosphere coupled model (2021)
  • Author(s): Tomotsugu Yamakawa, Kanako Seki, Takanobu Amano, Naoko Takahashi, Yoshizumi Miyoshi, Aoi Nakamizo
  • Organizer: Japan Geoscience Union 2021
  • Int'l Joint Research
• [Presentation] An observational study on possible excitation of storm-time Pc5 waves (2021)
  • Author(s): Kento Ohtani, Iku Shinohara, Mariko Teramoto, Tomotsugu Yamakawa, Kanako Seki, Satoshi Kasahara, Shoichiro Yokota, Kunihiro Keika, Naoko Takahashi, Takefumi Mitani, Nana Higashio, Ayako Matsuoka, Kazuhiro Yamamoto
  • Organizer: Japan Geoscience Union 2021
  • Int'l Joint Research
• [Presentation] Excitation mechanism of internally driven ULF waves by the drift-bounce resonance with ring current ions based on the Magnetosphere-Ionosphere coupled model (2021)
  • Author(s): Tomotsugu Yamakawa, Kanako Seki, Takanobu Amano, Yoshizumi Miyoshi, Naoko Takahashi, Aoi Nakamizo
  • Organizer: Joint Scientific Assembly IAGA-IASPEI 2021
  • Int'l Joint Research
• [Presentation] Two types of storm-time Pc5 ULF waves excited in the Magnetosphere-Ionosphere coupled model (2021)
  • Author(s): 山川智嗣、関華奈子、天野孝伸、高橋直子、三好由純、中溝葵
  • Organizer: 第150回 地球電磁気・地球惑星圏学会 総会・講演会
• [Presentation] Two-dimensional structure of drifting energetic electrons in the inner magnetosphere: Arase and Van Allen Probes observations (2021)
  • Author(s): T. Hori, Y. Miyoshi, T. Mitani, S. Kurita, M. Teramoto, T. Takashima, I. Shinohara, A. Matsuoka, S. G. Claudepierre, J. F. Fennell, J. B. Blake, C. A. Kletzing
  • Organizer: SuperDARN Workshop 2021
  • Int'l Joint Research
• [Presentation] 現象報告期間(2020.10-2021.03)におけるHOP radars/SuperDARN観測報告 (2021)
  • Author(s): 西谷望、堀智昭
  • Organizer: 第二回STE現象報告会
• [Presentation] SuperDARN北海道-陸別第一レーダーのイメージング化と期待できるサイエンス (2021)
  • Author(s): 西谷望、濱口佳之、堀智昭
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN HOPレーダー及び関連した情勢の報告 (2021)
  • Author(s): 西谷望
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN とあらせ衛星による SAPS 電場と粒子観測 (2021)
  • Author(s): 高田知弥、西谷望、堀智昭、他
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN レーダーを用いたSAPS の季節・経度依存性についての統計研究 (2021)
  • Author(s): 大矢健斗、西谷望、堀智昭
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] SuperDARN北海道-陸別第一・第二HF レーダーを用いたMSTID発生特性の統計解析 (2021)
  • Author(s): 枦山航、西谷望、堀智昭
  • Organizer: 極域・中緯度SuperDARN研究集会
• [Presentation] Study of ionospheric plasma dynamics at sub-auroral latitudes using the SuperDARN radars (2021)
  • Author(s): Nishitani, N.
  • Organizer: PWING-ERG Conference and School
  • Int'l Joint Research / Invited
• [Presentation] SuperDARN北海道-陸別第一・第二レーダーの2020年度運用報告 (2021)
  • Author(s): 西谷望
  • Organizer: 陸別ユーザーズミーティング
• [Presentation] Relative Contribution of ULF Waves and Whistler-mode Chorus to the Radiation Belt Variation during the May 2017 Storm (2021)
  • Author(s): Naoko Takahashi, Kanako Seki, Mei-Ching Fok, Yihua Zheng, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, David Hartley, Yoshiya Kasahara, Yasumasa Kasaba, Nana Higashio, Ayako Matsuoka, Shoichiro Yokota, Tomoaki Hori, Masafumi Shoji, Satoko Nakamura, Shun Imajo, Iku Shinohara
  • Organizer: Virtual Mini-GEM
  • Int'l Joint Research / Invited
• [Presentation] Relative Contribution of ULF Waves and Whistler-mode Chorus to the Radiation Belt Variation during the May 2017 Storm (2021)
  • Author(s): Naoko Takahashi, Kanako Seki, Mei-Ching Fok, Yihua Zheng, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, David Hartley, Yoshiya Kasahara, Yasumasa Kasaba, Nana Higashio, Ayako Matsuoka, Shoichiro Yokota, Tomoaki Hori, Masafumi Shoji, Satoko Nakamura, Shun Imajo, Iku Shinohara
  • Organizer: PWING-ERG conference and school
  • Int'l Joint Research
• [Presentation] On the origin of equatorward detachment of auroral arc inferred from conjugate space‐ground observations and the BATS-R-US - CIMI model (2021)
  • Author(s): S. Yadav, K. Shiokawa, S. Oyama, Y. Inaba, T. Hori, M. Shoji, C.-W. Jun, S. Imajo, Y. Miyoshi, N. Takahashi, et al.
  • Organizer: PWING-ERG conference and school
  • Int'l Joint Research
• [Presentation] Excitation mechanisms of the storm-time Pc5 ULF waves by the drift-bounce resonance with ring current ions based on the drift-kinetic model (2021)
  • Author(s): T. Yamakawa, K. Seki, T. Amano, N. Takahashi, and Y. Miyoshi
  • Organizer: PWING-ERG conference and school
  • Int'l Joint Research
• [Presentation] Multi-event analysis of SAPS WaveStructures observed by the SuperDARN Hokkaido Pair of radars (2020)
  • Author(s): Nozomu Nishitani, Tomoaki Hori, and Mariko Teramoto
  • Organizer: EGU General Assembly 2020 (online)
  • Int'l Joint Research
• [Presentation] Statistical study of SAPS occurrence characteristics using the SuperDARN HOkkaido Pair of (HOP) HF Radars (2020)
  • Author(s): 大矢 健斗、西谷 望、堀 智昭
  • Organizer: JpGU - AGU Joint Meeting 2020:Virtual
  • Int'l Joint Research
• [Presentation] Study of dependence of solar flare induced SuperDARN Doppler velocity on X-ray intensity, SZA and season (2020)
  • Author(s): 高田 知弥、西谷 望、堀 智昭
  • Organizer: JpGU - AGU Joint Meeting 2020:Virtual
  • Int'l Joint Research
• [Presentation] Review of the mid-latitude SuperDARN and the future of the SuperDARN (2020)
  • Author(s): 西谷 望
  • Organizer: JpGU - AGU Joint Meeting 2020:Virtual
  • Int'l Joint Research
• [Presentation] Spatial-temporal variations of the SAPS structure with recurrent period of a few minutes observed by the SuperDARN HOP radars (2020)
  • Author(s): 西谷 望、堀 智昭、寺本 万里子
  • Organizer: JpGU - AGU Joint Meeting 2020:Virtual
  • Int'l Joint Research
• [Presentation] Statistical study of seasonal dependence of MSTID occurrence and propagation velocity using the SuperDARN Hokkaido East HF radar (2020)
  • Author(s): 枦山 航、西谷 望、堀 智昭
  • Organizer: JpGU - AGU Joint Meeting 2020:Virtual
  • Int'l Joint Research
• [Presentation] あらせ衛星とSuperDARNによるSAPS電場の同時観測 (2020)
  • Author(s): 高田 知弥、西谷望、堀智昭、他
  • Organizer: 第13回あらせサイエンス会議/2020年度内部磁気圏研究集会
• [Presentation] Study of ionospheric dynamics using the Super Dual Auroral Radar Network (SuperDARN) Hokkaido Pair of (HOP) radars (2020)
  • Author(s): 西谷 望
  • Organizer: 次世代の宇宙地球環境研究にむけた電波観測技術検討会・"Technology for Next Generation Space-Earth Environmental Radio Science", a workshop by ISEE
  • Int'l Joint Research
• [Presentation] 現象報告期間 (2019.09 2020.09) における HOP radars/SuperDARN 観測報告 (2020)
  • Author(s): 西谷望、堀智昭、 SuperDARN PIs
  • Organizer: 第一回STE現象報告会
• [Presentation] SuperDARN レーダーで見る SAPS 発生特性の地磁気活動・季節 依存性 (2020)
  • Author(s): 大矢健斗、西谷望、堀智昭
  • Organizer: 第一回STE現象報告会
• [Presentation] USRP高周波受信ユニットを活用した中緯度 SuperDARNイメージング受信機の開発 (2020)
  • Author(s): 西谷望 、 濱口佳之 、 堀智昭
  • Organizer: MTI研究集会
• [Presentation] SuperDARN北海道-陸別第一・第二HFレーダーデータへの3次元フーリエ変換手法の適用 (2020)
  • Author(s): 枦山航、西谷望、堀智昭
  • Organizer: MTI研究集会
• [Presentation] USRP高周波受信ユニットを活用した中緯度SuperDARNイメージング受信機の構築に向けて (2020)
  • Author(s): 西谷 望, 濱口 佳之, 堀 智昭
  • Organizer: 第148回地球電磁気・地球惑星圏学会の総会および講演会
• [Presentation] SuperDARNネットワークのデータ管理体制: 現状と今後の課題 (2020)
  • Author(s): 西谷 望, 行松 彰, 長妻 努,堀 智昭
  • Organizer: 第148回地球電磁気・地球惑星圏学会の総会および講演会
• [Presentation] Statistical analysis of seasonal and solar activity dependences of MSTID occurrence using the SuperDARN Hokkaido pair of radars (2020)
  • Author(s): 枦山 航, 西谷 望, 堀 智昭
  • Organizer: 第148回地球電磁気・地球惑星圏学会の総会および講演会
• [Presentation] あらせ衛星とSuperDARNによるSAPS電場の同時観測 (2020)
  • Author(s): 高田 知弥, 西谷 望, 堀 智昭, Shepherd Simon G., 笠羽 康正, 熊本 篤志, 加藤 雄人, 笠原 禎也, 小路 真史, 中村 紗都子, 北原 理弘, 土屋 史紀, 浅村 和志, 三好 由純, 風間 洋一, Wang S.-Y., Jun C.-W., 横田 勝一郎, 笠原 慧, 桂華 邦裕, 松岡 彩子, 今城 峻, 篠原 育
  • Organizer: 第148回地球電磁気・地球惑星圏学会の総会および講演会
• [Presentation] Study of the seasonal dependence of SAPS occurrence using the SuperDARN radars (2020)
  • Author(s): 大矢 健斗, 西谷 望, 堀 智昭
  • Organizer: 第148回地球電磁気・地球惑星圏学会の総会および講演会
• [Presentation] Toward the development of the SuperDARN receiver system with improved spatial and temporal resolution (2020)
  • Author(s): Nozomu Nishitani, Tomoaki Hori and Yoshiyuki Hamaguchi
  • Organizer: AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] Study of the occurrence characteristics of SAPS observed by the SuperDARN Hokkaido Pair of Radars (2020)
  • Author(s): Kento Oya, Nozomu Nishitani and Tomoaki Hori
  • Organizer: AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] Simultaneous observations of the electric field and particle characteristics in the plasmapause / SAPS region with the Arase satellite and SuperDARN radars (2020)
  • Author(s): Tomoya Takada, Nozomu Nishitani, Tomoaki Hori, Simon Shepherd, et al.
  • Organizer: AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] Statistical analysis of MSTID diurnal behavior and solar activity dependence using the SuperDARN Hokkaido pair of radars (2020)
  • Author(s): Wataru Hazeyama, Nozomu Nishitani and Tomoaki Hori
  • Organizer: AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] Development of the imaging receiver system for the SuperDARN Hokkaido East radar (2020)
  • Author(s): Nishitani, N., Y. Hamaguchi, T. Hori
  • Organizer: 11th Symposium on Polar Science
  • Int'l Joint Research
• [Presentation] Observation and Numerical Simulation of Propagation of ULF Waves From the Ion Foreshock Into the Magnetosphere (2020)
  • Author(s): Kazue Takahashi, Turc Turc, Emilia Kilpua, Naoko Takahashi, Andrew Dimmock, Primoz Kajdic, Minna Palmroth, Yann Pfau-Kempf, Jan Soucek, Howard Singer, Tetsuo Motoba, and Craig Kletzing
  • Organizer: EGU General Assembly 2020 (online)
  • Int'l Joint Research
• [Presentation] Relative contribution of ULF and chorus waves to the radiation belt variation: Comparison between multi-point observations and BATSRUS+CRCM simulation (2020)
  • Author(s): 高橋 直子、関 華奈子、Mei-Ching Fok、Yihua Zheng、三好 由純、笠原 慧、桂華 邦裕、David Hartley、笠原 禎也、笠羽 康正、東尾 奈々、松岡 彩子、横田 勝一郎、堀 智昭、篠原 育
  • Organizer: JpGU - AGU Joint Meeting 2020:Virtual
  • Int'l Joint Research
• [Presentation] Study of the excitation mechanism of storm-time Pc5 ULF waves by ring current ions based on the drift-kinetic simulation (2020)
  • Author(s): 山川 智嗣、関 華奈子、天野 孝伸、高橋 直子、三好 由純
  • Organizer: JpGU - AGU Joint Meeting 2020:Virtual
  • Int'l Joint Research
• [Presentation] Study of an equatorward detachment of auroral arc from the oval using ground-space observations and the BATSRUS+CRCM model (2020)
  • Author(s): Sneha Yadav, K. Shiokawa, S. Oyama, Y. Inaba, N. Takahashi, K. Seki, Y. Kazama, S.-Yu. Wang, Tzu-Fang Chang, K. Asamura, S. Kasahara, S. Yokota, T. Hori, K. Keika, Y. Kasaba, F. Tsuchiya, A. Kumamoto, M. Shoji, Y. Kasahara, A. Matsuoka, S. Matsuda, C.-W. Jun, S. Imajo, Y. Miyoshi, I. Shinohara
  • Organizer: 第13回ERGサイエンス会議
• [Presentation] Relative Contribution of ULF Waves and Whistler-mode Chorus to the Radiation Belt Variation during the May 2017 Storm (2020)
  • Author(s): 高橋直子、関華奈子、Mei-Ching Fok、Yihua Zheng、三好由純、笠原慧、桂華邦裕、David Hartley、笠原禎也、笠羽康正、
  • Organizer: 地球電磁気・地球惑星圏学会第148回総会・講演会
• [Presentation] Study of internally driven ULF waves by ring current ions based on the Magnetosphere-Ionosphere coupled model (2020)
  • Author(s): 山川 智嗣、関 華奈子、天野 孝伸、高橋 直子、三好 由純、中溝葵
  • Organizer: 地球電磁気・地球惑星圏学会第148回総会・講演会
• [Presentation] Study of an equatorward detachment of auroral arc from the oval using ground-space observations and the BATSRUS+CRCM model (2020)
  • Author(s): Sneha Yadav, K. Shiokawa, S. Oyama, Y. Inaba, N. Takahashi, K. Seki, Y. Kazama, S.-Yu. Wang, Tzu-Fang Chang, K. Asamura, S. Kasahara, S. Yokota, T. Hori, K. Keika, Y. Kasaba, F. Tsuchiya, A. Kumamoto, M. Shoji, Y. Kasahara, A. Matsuoka, S. Matsuda, C.-W. Jun, S. Imajo, Y. Miyoshi, I. Shinohara
  • Organizer: 地球電磁気・地球惑星圏学会第148回総会・講演会
• [Presentation] Relative Contribution of ULF Waves and Whistler-mode Chorus to the Radiation Belt Variation (2020)
  • Author(s): Naoko Takahashi, Kanako Seki, Mei-Ching Fok, Yihua Zheng, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, David Hartley, Yoshiya Kasahara, Yasumasa Kasaba, Nana Higashio, Ayako Matsuoka, Shoichiro Yokota, Tomoaki Hori, Masafumi Shoji, Satoko Nakamura, Shun Imajo, Iku Shinohara
  • Organizer: The 9th VERSIM Workshop (online)
  • Int'l Joint Research
• [Presentation] Study of the Excitation Mechanism of Storm-Time Pc5 ULF Waves by Ring Current Ions Based on the Drift-Kinetic Simulation (2020)
  • Author(s): T. Yamakawa, K. Seki, T. Amano, N. Takahashi, and Y. Miyoshi
  • Organizer: The 9th VERSIM Workshop (online)
  • Int'l Joint Research
• [Presentation] Relative Contribution of ULF Waves and Whistler-mode Chorus to the Radiation Belt Variation during the May 2017 Storm (2020)
  • Author(s): Naoko Takahashi, Kanako Seki, Mei-Ching Fok, Yihua Zheng, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, David Hartley, Yoshiya Kasahara, Yasumasa Kasaba, Nana Higashio, Ayako Matsuoka, Shoichiro Yokota, Tomoaki Hori, Masafumi Shoji, Satoko Nakamura, Shun Imajo, Iku Shinohara
  • Organizer: AGU Fall meeting
  • Int'l Joint Research
• [Presentation] Excitation mechanisms of the storm-time Pc5 ULF waves by the drift-bounce resonance with ring current ions based on the Magnetosphere-Ionosphere coupled model (2020)
  • Author(s): T. Yamakawa, K. Seki, T. Amano, N. Takahashi, Y. Miyoshi, and A. Nakamizo
  • Organizer: AGU Fall meeting
  • Int'l Joint Research
• [Presentation] Review of mid-latitude SuperDARN / future of SuperDARN (2020)
  • Author(s): Nishitani, N.
  • Organizer: 2020 ERG Science and Space Weather Workshop
  • Int'l Joint Research
• [Presentation] SuperDARN北海道-陸別第一・第二HFレーダーの2019年度活動報告 (2020)
  • Author(s): 西谷望
  • Organizer: 陸別ユーザーズミーティング
• [Presentation] Multiscale Coupling of Sub-auroral Polarization Streams (2019)
  • Author(s): Nishitani, N., and T. Hori
  • Organizer: 日本地球惑星科学連合2019年大会
  • Int'l Joint Research
• [Presentation] SuperDARN Hokkaido Pair of (HOP) radars and mid-latitude SuperDARN: today and future (2019)
  • Author(s): Nishitani, N.
  • Organizer: 日本地球惑星科学連合2019年大会
  • Int'l Joint Research
• [Presentation] Mid-latitude SuperDARN Review Paper (2019)
  • Author(s): Nishitani, N., et al.
  • Organizer: SuperDARN Workshop 2019
  • Int'l Joint Research / Invited
• [Presentation] Multiscale Coupling of Sub-auroral Polarization Streams Observed by the SuperDARN Hokkaido East / West Radars (2019)
  • Author(s): Nishitani, N., and T. Hori
  • Organizer: SuperDARN Workshop 2019
  • Int'l Joint Research
• [Presentation] Review of Mid-latitude SuperDARN (2019)
  • Author(s): Nishitani, N.
  • Organizer: 2019 URSI-Japan Radio Science Meeting (URSI-JRSM 2019)
  • Int'l Joint Research
• [Presentation] 現象報告期間(2019.03-09)におけるHOP radars/SuperDARN観測報告 (2019)
  • Author(s): 西谷望、堀智昭、SuperDARN PIs
  • Organizer: STE 現象報告会
• [Presentation] SuperDARN / Mid-latitude SuperDARN - past, present and future (2019)
  • Author(s): Nishitani, N., SuperDARN Pis
  • Organizer: MTI研究集会
• [Presentation] Multi-event study of SAPS Wave Structures observed by the SuperDARN radars (2019)
  • Author(s): Nishitani, N., and T. Hori
  • Organizer: 第146回地球電磁気・地球惑星圏学会
• [Presentation] Mid-latitude SuperDARN Review Paper (2019)
  • Author(s): Nishitani, N.
  • Organizer: High Frequency Radar Data Application Seminar
  • Int'l Joint Research / Invited
• [Presentation] SAPS Wave Structures observed by the SuperDARN Hokkaido Pair of radars: multievent analysis (2019)
  • Author(s): Nishitani, N., and T. Hori
  • Organizer: American Geophysical Union Fall Meeting 2019
  • Int'l Joint Research
• [Presentation] Statistical study of SAPS occurrence characteristics using the SuperDARN Hokkaido East HF Radar (2019)
  • Author(s): Oya, K., N. Nishitani, T. Hori
  • Organizer: 日本地球惑星科学連合2019年大会
  • Int'l Joint Research
• [Presentation] Statistical study of SAPS occurrence characteristics using the SuperDARN Hokkaido East HF Radar (2019)
  • Author(s): Oya, K., N. Nishitani, T. Hori
  • Organizer: SuperDARN Workshop 2019
  • Int'l Joint Research
• [Presentation] Study of the occurrence characteristics of SAPS observed by the SuperDARN Hokkaido East Radar with the beam-swing technique (2019)
  • Author(s): Oya, K., N. Nishitani, T. Hori
  • Organizer: 第146回地球電磁気・地球惑星圏学会
• [Presentation] Temporal and spatial evolutions of storm-time ionospheric disturbances in the low and midlatitudes as seen in the GNSS-TEC and SuperDARN radar observations (2019)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Takuya Tsugawa, Michi Nishioka, William Bristow, J. Michael Ruohoniemi, Simon G. Shepherd, and Nozomu Nishitani
  • Organizer: SuperDARN Workshop 2019
  • Int'l Joint Research
• [Presentation] Characteristics of Storm Enhanced Density in the Mid- and Low-Latitudes as Seen in the Global TEC Variations (2019)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Takuya Tsugawa, and Michi Nishioka
  • Organizer: 27th IUGG General Assembly
  • Int'l Joint Research
• [Presentation] Characteristics of Temporal and Spatial Evolutions of the Ionosphere and Plasmasphere During Major Geomagnetic Storms Observed by GNSS-TEC and Arase Observations (2019)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Takuya Tsugawa, Michi Nishioka, Atsushi Kumamoto, Fuminori Tsuchiya, Shoya Matsuda, Yoshiya Kasahara, and Ayako Matsuoka
  • Organizer: Asia Oceania Geosciences Society (AOGS) 2019
  • Int'l Joint Research
• [Presentation] Characteristics of temporal and spatial evolutions of storm-time ionospheric disturbances using global total electron content obtained from GNSS receiver network (2019)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Takuya Tsugawa, and Michi Nishioka
  • Organizer: 2019 URSI-Japan Radio Science Meeting (URSI-JRSM 2019)
  • Int'l Joint Research
• [Presentation] Temporal and spatial evolutions of electron density distribution in the ionosphere during a geomagnetic storm as seen in the GNSS-TEC and SuperDARN radar observations (2019)
  • Author(s): Atsuki Shinbori, Yuichi Otsuka, Takuya Sori, Takuya Tsugawa, and Michi Nishioka
  • Organizer: American Geophysical Union Fall Meeting 2019
  • Int'l Joint Research
• [Presentation] 全球 GNSS-TEC データを用いた磁気嵐時におけるグローバルな電離圏電子密度変動の特徴とその生成要因について (2019)
  • Author(s): 新堀淳樹、大塚雄一、惣宇利卓弥、津川卓也、西岡未知
  • Organizer: 「STE 現象報告会」「MTI 研究集会」「宇宙空間からの地球超高層大気観測に関する研究会」「太陽地球系物理学分野のデータ解析手法、ツールの理解と応用」合同研究集会
• [Presentation] GNSS-TECとSuperDARNレーダー観測に見られるSEDの時間・空間発展について (2019)
  • Author(s): 新堀 淳樹, 大塚 雄一, 惣宇利 卓弥, 津川 卓也, 西岡 未知, Bristow William A., Ruohoniemi John M., Shepherd Simon G., 西谷 望
  • Organizer: 地球電磁気・地球惑星圏学会 第146回講演会
• [Presentation] Relative contribution of ULF and chorus waves to the radiation belt variation: Comparison between multi-point observations and BATSRUS+CRCM simulation (2019)
  • Author(s): Naoko Takahashi, Kanako Seki, Mei-Ching Fok, Yihua Zheng, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, David Hartley, Yoshiya Kasahara, Yasumasa Kasaba, Nana Higashio, Ayako Matsuoka, Shoichiro Yokota, Tomoaki Hori, Iku Shinohara
  • Organizer: 日本地球惑星科学連合2019年大会
  • Int'l Joint Research
• [Presentation] Relative contribution of ULF and chorus waves to the radiation belt variation: Comparison between multi-point observations and BATSRUS + CRCM simulation (2019)
  • Author(s): Naoko Takahashi, Kanako Seki, Mei-Ching Fok, Yihua Zheng, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, David Hartley, Yoshiya Kasahara, Yasumasa Kasaba, Nana Higashio, Ayako Matsuoka, Shoichiro Yokota, Tomoaki Hori, Iku Shinohara
  • Organizer: 地球電磁気・地球惑星圏学会 第146回総会・講演会
• [Presentation] ドリフト運動論モデルに基づく環電流イオンとのドリフトバウンス共鳴によって励起されるstorm-time Pc5 ULF波動の研究 (2019)
  • Author(s): 山川 智嗣,関 華奈子,天野 孝伸,高橋 直子,三好 由純
  • Organizer: 地球電磁気・地球惑星圏学会 第146回総会・講演会
• [Presentation] Relative contribution of ULF and chorus waves to the radiation belt variation: Comparison between multi-point observations and BATSRUS + CRCM simulation (2019)
  • Author(s): Naoko Takahashi, Kanako Seki, Mei-Ching Fok, Yihua Zheng, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, David Hartley, Yoshiya Kasahara, Yasumasa Kasaba, Nana Higashio, Ayako Matsuoka, Shoichiro Yokota, Tomoaki Hori, Iku Shinohara
  • Organizer: AGU Fall Meeting 2019
  • Int'l Joint Research
• [Presentation] Excitation mechanisms of the storm-time Pc5 ULF waves by drift-bounce resonance with ring current ions based on the global drift-kinetic simulation (2019)
  • Author(s): Tomotsugu Yamakawa, Kanako Seki, Takanobu Amano, Yoshizumi Miyoshi, Naoko Takahashi
  • Organizer: AGU Fall Meeting 2019
  • Int'l Joint Research
• [Presentation] Review of the mid-latitude SuperDARN (2019)
  • Author(s): 西谷 望
  • Organizer: 電磁圏シンポジウム
• [Presentation] 現象報告期間(2018.9-2019.3)における北海道-陸別第一・第二レーダーを中心としたSuperDARN観測報告 (2019)
  • Author(s): 西谷 望、堀 智昭
  • Organizer: 平成30年度第二回STE現象報告会
• [Presentation] 北海道-陸別HFレーダーと中緯度SuperDARNのレビュー (2019)
  • Author(s): 西谷 望
  • Organizer: 陸別ユーザーズミーティング
• [Presentation] あらせ衛星-SuperDARN レーダー同時共役観測によって明らかに なった超低周波磁束管振動 (2019)
  • Author(s): T. Hori, N. Nishitani, S. G. Shepherd, J. M. Ruohoniemi, M. Connors, M. Teramoto, et al.
  • Organizer: 太陽研連シンポジウム「太陽研究の将来展望」
  • Invited
• [Presentation] Arase-SuperDARNキャンペーン報告 (2019)
  • Author(s): T. Hori, N. Nishitani, A. S. Yukimatu, T. Nagatsuma, K. Hosokawa, H. Kawano, M. Watanabe, M. Teramoto
  • Organizer: 第11回ERGサイエンス会議・あらせ衛星の電場・プラズマ波動観測データを用いた解析ワークショップ
• [Presentation] Short temporal scale electric field fluctuations inside SAPS structure observed by the SuperDARN HOP radars (2018)
  • Author(s): 西谷 望・堀 智昭・寺本 万里子
  • Organizer: 地球電磁気・地球惑星圏学会第144回総会・講演会
• [Presentation] Study of Ionospheric Conductivity Dependence of the SAPS using the SuperDARN Hokkaido East HF Radar (2018)
  • Author(s): 張玉テイ、西谷望、堀智昭
  • Organizer: 地球電磁気・地球惑星圏学会第144回総会・講演会
• [Presentation] Characteristics of dynamics of fast westward flows in the subauroral region during the 2018 August geomagnetic storm (2018)
  • Author(s): 西谷 望、堀 智昭・張 玉テイ
  • Organizer: 極域科学シンポジウム
  • Int'l Joint Research
• [Remarks] SuperDARN北海道-陸別HFレーダー
  • URL: http://cicr.isee.nagoya-u.ac.jp/hokkaido/
• [Funded Workshop] SuperDARN Workshop 2019 (2019)