Prediction of solar cycle activity and investigation of its impact on climate

2018 Fiscal Year Annual Research Report

• Project Area: Solar-Terrestrial Environment Prediction as Science and Social Infrastructure
• Project/Area Number: 15H05816
• Research Institution: Kyoto University
• Principal Investigator: 余田 成男 京都大学, 理学研究科, 教授 (30167027)
• Co-Investigator(Kenkyū-buntansha): 櫻井 隆 国立天文台, 太陽観測科学プロジェクト, 名誉教授 (40114491) ; 今田 晋亮 名古屋大学, 宇宙地球環境研究所, 講師 (40547965) ; 宮原 ひろ子 武蔵野美術大学, 造形学部, 准教授 (00532681) ; 浅井 歩 京都大学, 理学研究科, 准教授 (50390620) ; 上野 悟 京都大学, 理学研究科, 助教 (70303807) ; 吉田 康平 気象庁気象研究所, 気候研究部, 研究官 (10636038)
• Project Period (FY): 2015-06-29 – 2020-03-31
• Keywords: 太陽物理学 / 地球システム科学 / 太陽活動変動 / 宇宙線変動 / 気候変動

Outline of Annual Research Achievements

太陽磁場精密観測グループは、国立天文台・三鷹の磁場観測装置（赤外マグネトグラフ）の装置論文を出版し、日本評論社「シリーズ現代の天文学 第10巻『太陽』（桜井、小島、小杉、柴田編）の改訂第2版を出版した。太陽周期予測数値計算グループは、約11年周期の太陽活動変動の次期周期活動を予測するモデル計算コードの開発及び実装、そして計算に必要なパラメターの観測精度の向上を行ってきた。本年度は特にこの計算に必要なパラメターである速度場について、衛星観測データを用いて算出した結果、磁場の強い領域での子午面方向の流れは、磁場の弱い領域に比べて遅いことがわかった。

太陽放射変動グループは、較正済みの太陽彩層画像(カルシウムK線)の乾板データアーカイブから太陽紫外線強度の指標であるプラージュ・インデックスを導出し、それで特徴づけられる太陽活動変動に対する地球高層大気の応答の相関関係を求めた。日本における雷活動の太陽自転周期成分の長期的傾向を明らかにするため、宇宙線変動グループでは、古典籍に残された200年分の雷の記述について、黒点数のレベル毎に周期解析を行い、太陽活動が活発になり黒点数が増えるほど、太陽自転周期のシグナルが強く雷活動に現れていたことが確認された。また、弘前のデータの解析から、小氷期において自転周期のシグナルが現れる北限が変化していた可能性も示唆された。

地球システムモデル計算グループは、太陽高エネルギー粒子によるNOx, HOx生成過程を導入したMRI地球システムモデルを用いて、大気海洋結合モデル相互比較プロジェクトCMIP6に準拠した実験を継続し、2003年などの顕著な高エネルギー粒子による地球大気への影響を調査した。さらに、公募研究と協働して高精度雲モデルに宇宙線による雲電荷過程の導入を行いつつ、さらなるモデル改良を行い、より精緻な太陽活動影響を取り込めるようにした。

Current Status of Research Progress

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

Reason

各グループ共に、これまでの研究成果をまとめた論文出版が順調に進捗している。
太陽周期活動の予測に関する基本目標については、太陽周期活動の変動メカニズムに基づく予測型太陽ダイナモモデルを開発が終り、地上観測や「ひので」衛星観測から求めた磁場の輸送速度、磁気拡散係数、電流ヘリシティ等のパラメータを用いた第25太陽周期の活動予測が順調に進捗し、論文成果もあがっている。

太陽活動変動の気候影響に関する基本目標については、全太陽放射強度、太陽放射スペクトル、および高エネルギー粒子降下変動の影響を気象研究所地球システムモデルに組み込むという目標が達成でき、CMIP6に準拠した実験が進んでいる。京都で開催した国際研究集会を契機に、当初予期していなかったベルリン自由大学との国際共同研究が具体化し、次年度にはポスドク研究員を受け入れて、同大学の化学気候モデルを用いた高エネルギー粒子起源のパッシブトレーサー輸送沈着実験を行う準備が整った。

発展目標の一つに、マウンダーミニマムのような極端な状況を作り出す原因を観測データ解析・試料分析・数値実験から探ることをあげているが、宇宙線生成核種を単年分解能で精密測定することで、小氷期における太陽活動周期変動の詳細解析が実行できうる段階となった。

Strategy for Future Research Activity

次期太陽周期予測関係では、長期継続観測データを用いて主要パラメータの10年スケールでの時間変動を解析し、表面磁束輸送モデルを用いて次期太陽活動極小期の極域磁場を推定して、第25太陽周期の予測を行う。国際共同研究として海外他機関の予測結果と相互比較を行うとともに、これらのモデル計算の物理的妥当性を検証する。

太陽放射・宇宙線変動関係では、人工衛星観測太陽紫外線分光データと太陽彩層画像とを直接比較して、紫外線強度変動の指標の導出法を確立し、過去100年にわたる太陽紫外線強度の長期変動を再現する。また、樹木年輪、氷床コア、湖底堆積物の宇宙線生成核種を単年分解能で精密測定し、小氷期における太陽活動周期及び宇宙線強度変動の詳細解析を行う。併せて、太陽フレア等に伴う宇宙線強度低下に対応した雲活動・雷活動の応答を解析する。

太陽活動変動気候影響関係では、太陽高エネルギー粒子の影響を組み込んだMRI地球システムモデルを用いて、次期大気海洋結合モデル相互比較プロジェクトCMIP6に準拠した実験と出力データ解析を行う。また、気候モデル数値実験と古気候試料分析の連携・国際共同研究として、ベルリン自由大学の化学気候モデルを用いて775年の三宅イベントを事例とする10Beの移流実験を行い、地質学的試料分析の制約条件をより限定する。

Research Products

• [Int'l Joint Research] 中国科学院雲南天文台(中国)
  • Country Name: CHINA
  • Counterpart Institution: 中国科学院雲南天文台
• [Int'l Joint Research] East China Normal Univ.(中国)
  • Country Name: CHINA
  • Counterpart Institution: East China Normal Univ.
• [Int'l Joint Research] ベルリン自由大学(ドイツ)
  • Country Name: GERMANY
  • Counterpart Institution: ベルリン自由大学
• [Journal Article] QBO-Like Oscillation in a Three-Dimensional Minimal Model Framework of the Stratosphere-Troposphere Coupled System (2019)
  • Author(s): Hai Bui, Shigeo Yoden, Eriko Nishimoto
  • Journal Title: SOLA Volume: 15 Pages: 62-67
  • DOI: 10.2151/sola.2019-013
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Weak influence of near-surface layer on solar deep convection zone revealed by comprehensive simulation from base to surface (2019)
  • Author(s): H. Hotta, H. Iijima, K. Kusano
  • Journal Title: Science Advances Volume: 5 Pages: eaau2307
  • DOI: 10.1126/sciadv.aau2307
  • Peer Reviewed / Open Access
• [Journal Article] The Extreme Space Weather Event in September 1909 (2019)
  • Author(s): Hayakawa, H., Ebihara, Y., Cliver, E. W., Hattori, K., Toriumi, S., Love, J. J., Umemura, N., Namekata, K., Sakaue, T., Takahashi, T., Shibata, K.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 484 Pages: 4083-4099
  • DOI: 10.1093/mnras/sty3196
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Semiconservative reduced speed of sound technique for low Mach number flows with large density variations (2019)
  • Author(s): H. Iijima, H. Hotta, S. Imada
  • Journal Title: Astronomy and Astrophysics Volume: 622 Pages: A157
  • DOI: 10.1051/0004-6361/201834031
  • Peer Reviewed / Open Access
• [Journal Article] Status of the AMS system at Yamagata University (2019)
  • Author(s): Toru Moriya, Mirei Takeyama, Hirohisa Sakurai, Toyoharu Umebayashi, Teiko Toyoguchi, Tadashi Shiraishi, Hiroko Miyahara, Motonari Ohyama, Kohei Nozawa, Satoshi Ito, Shigeru Itoh, Masashi Hirota, Fuyuki Tokanai
  • Journal Title: NIMB Volume: 439 Pages: 94-99
  • DOI: 10.1016/j.nimb.2018.11.004
  • Peer Reviewed
• [Journal Article] The Stratosphere and Its Role in Tropical Teleconnections (2018)
  • Author(s): Osprey Scott、Geller Marvin、Yoden Shigeo
  • Journal Title: Eos Volume: 99 Pages: 2232-2239
  • DOI: 10.1029/2018EO097387
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Mitigation of global cooling by stratospheric chemistry feedbacks in a simulation of the last glacial maximum (2018)
  • Author(s): Noda. S., Kodera, K., Adachi, Y., Deushi, M., Kitoh, A., Mizuta, R., Murakami, S., Yoshida, K., and Yoden, S.
  • Journal Title: Journal of Geophysical Research: Atmospheres Volume: 123 Pages: 9378--9390
  • DOI: 10.1029/2017JD028017
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Detection of solar cycle signal in the tropospheric temperature using COSMIC data (2018)
  • Author(s): V. Kumar, S. K. Dhaka, V. Panwar, Narendra Singh, A. S. Rao, Shristy Malik, and S. Yoden
  • Journal Title: CURRENT SCIENCE Volume: 115-12 Pages: 2232-2239
  • DOI: 10.18520/cs/v115/i12/2232-2239
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Asteroseismic detection of latitudinal differential rotation in 13 Sun-like stars (2018)
  • Author(s): Benomar, O., Bazot, M., Nielsen, M. B., Gizon, L., Sekii, T., Takata, M., Hotta, H., Hanasoge, S., Sreenivasan, K. R., Christensen-Dalsgaard, J.
  • Journal Title: Science Volume: 361 Pages: 1231-1234
  • DOI: 10.1126/science.aao6571
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Effect of Magnetic Field Strength on Solar Differential Rotation and Meridional Circulation (2018)
  • Author(s): Imada, S., Fujiyama, M.
  • Journal Title: The Astrophysical Journal Letters Volume: 864 Pages: 15
  • DOI: 10.3847/2041-8213/aad904
  • Peer Reviewed
• [Journal Article] Sunspot drawings by Japanese official astronomers in 1749-1750 (2018)
  • Author(s): Hayakawa, H., Iwahashi, K., Fujiyama, M., Kawai, T., Toriumi, S., Hotta, H., Iijima, H., Imada, S., Tamazawa, H., Shibata, K.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Pages: 63
  • Peer Reviewed / Open Access
• [Journal Article] A great space weather event in February 1730 (2018)
  • Author(s): Hayakawa, H., Ebihara, Y., Vaquero, J. M., Hattori, K., Carrasco, V. M. S., De la Cruz Gallego, M., Hayakawa, S., Watanabe, Y., Iwahashi, K., Tamazawa, H., Kawamura, A. D., Isobe, H.
  • Journal Title: Astronomy & Astrophysics Volume: 616 Pages: A177
  • DOI: 10.1051/0004-6361/201832735
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sporadic auroras near the geomagnetic equator: in the Philippines, on 27 October 1856 (2018)
  • Author(s): Hayakawa, H., Vaquero, J. M., Ebihara, Y.
  • Journal Title: Annales Geophysicae Volume: 34 Pages: 1153--1160
  • DOI: 10.5194/angeo-36-1153-2018
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Great Space Weather Event during 1872 February Recorded in East Asia (2018)
  • Author(s): Hayakawa, H., Ebihara, Y., Willis, D. M., Hattori, K., Giunta, A. S., Wild, M. N., Hayakawa, S., Toriumi, S., Mitsuma, Y., Macdonald, L. T., Shibata, K., Silverman, S. M.
  • Journal Title: The Astrophysical Journal Volume: 862 Pages: 15
  • DOI: 10.3847/1538-4357/aaca40
  • Peer Reviewed / Open Access
• [Journal Article] Low-Latitude Aurorae during the Extreme Space Weather Events in 1859 (2018)
  • Author(s): Hayakawa, H., Ebihara, Y., Hand, D. P., Hayakawa, S., Kumar, S., Mukherjee, S., Veenadhari, B.
  • Journal Title: The Astrophysical Journal Volume: 869 Pages: 57
  • DOI: 10.3847/1538-4357/aae47c
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] On the intensity of the magnetic superstorm of September 1909 (2018)
  • Author(s): Love, J. J., Hayakawa, H., Cliver, E. W.
  • Journal Title: Space Weather Volume: 17 Pages: 37-45
  • DOI: 10.1029/2018SW002012
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ALMA Observations of the Solar Chromosphere on the Polar Limb (2018)
  • Author(s): T. Yokoyama, M. Shimojo, T. J. Okamoto, H. Iijima
  • Journal Title: The Astrophysical Journal Volume: 863 Pages: 96
  • DOI: 10.3847/1538-4357/aad27e
  • Peer Reviewed
• [Journal Article] Image Enhancement for the Observation of the Solar Corona (2018)
  • Author(s): Zhao, M.Y., Liu, Y., Song, T.F., .Zhang, X.F., Hagino, M., and Sakurai, T.
  • Journal Title: Proceedings of the SPIE Volume: 10701 Pages: 1070129
  • DOI: 2018SPIE10701E..29Z/
  • Int'l Joint Research
• [Journal Article] Infrared Spectro-Polarimeter on the Solar Flare Telescope at NAOJ/Mitaka (2018)
  • Author(s): Sakurai, T., Hanaoka, Y., Arai, T., Hagino, M., Kawate, T.,Kitagawa, N., Kobiki, T., Miyashita, M., Morita, S., Otsuji, K.,Shinoda, K., Suzuki, I., Yaji, K., Yamasaki, T., Fukuda, T., Noguchi, M., Takeyama, N., Kanai, Y., and Yamamuro, T.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Pages: 58
  • DOI: 10.1093/pasj/psy050
  • Peer Reviewed
• [Journal Article] Intermodel differences in upwelling in the tropical tropopause layer among CMIP5 models (2018)
  • Author(s): Yoshida, K., R. Mizuta, and O. Arakawa
  • Journal Title: Journal of Geophysical Research: Atmospheres Volume: 123 Pages: 13658-13675
  • DOI: 10.1029/2018JD029044
  • Peer Reviewed
• [Journal Article] No robust evidence of future changes in major stratospheric sudden warmings: a multi-model assessment from CCMI (2018)
  • Author(s): Ayarzagena, B., Polvani, L. M., Langematz, U., Akiyoshi, H., Bekki, S., Butchart, N., Dameris, M., Deushi, (他15名), K., Yamashita, Y., Yoshida, K., and Zeng, G.
  • Journal Title: Atmospheric Chemistry and Physics Volume: 18 Pages: 11277-11287
  • DOI: 10.5194/acp-18-11277-2018
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The representation of solar cycle signals in stratospheric ozone -- Part 2: Analysis of global models (2018)
  • Author(s): Maycock, A. C., Matthes, K., Tegtmeier, S., Schmidt, H., Thiblemont, R., Hood, L., Akiyoshi, H., Bekki, S., Deushi, M., Jckel, P., Kirner, O., Kunze, M., Marchand, M., Marsh, D. R., Michou, M., Plummer, D., Revell, L. E., Rozanov, E., Stenke, A., Yamashita, Y., and Yoshida, K.
  • Journal Title: Atmospheric Chemistry and Physics Volume: 18 Pages: 11323-11343
  • DOI: 10.5194/acp-18-11323-2018
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Large-Scale Tropospheric Transport in the Chemistry Climate Model Initiative (CCMI) Simulations (2018)
  • Author(s): Orbe, C., Deushi, M., Tanaka, T. Y., Yoshida, K., Akiyoshi, H., Yamashita, Y., Stenke, A., Revell, L., Sukhodolov, T., Rozanov, E., Pitari, G., Visioni, D., Stone, K. A., and Schofield, R.
  • Journal Title: Atmospheric Chemistry and Physics Volume: 18 Pages: 7217-7235
  • DOI: 10.5194/acp-2017-1038
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Assessment of northeastern Japan tree-ring oxygen isotopes for reconstructing early summer hydroclimate and spring Arctic Oscillation (2018)
  • Author(s): W. Sakashita, Y. Yokoyama, H. Miyahara, T. Aze, S. P. Obrochta, M. Ohyama, H. Yonenobu
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 19 Pages: 3520-3528
  • DOI: 10.1029/2018GC007634
  • Peer Reviewed
• [Journal Article] Solar Rotational Cycle in Lightning Activity in Japan during the 18-19th Centuries (2018)
  • Author(s): Hiroko Miyahara, Ryuho Kataoka, Takehiko Mikami, Masumi Zaiki, Junpei Hirano, Minoru Yoshimura, Yasuyuki Aono, and Kiyomi Iwahashi
  • Journal Title: ANGEO Communicates Volume: 36 Pages: 633-640
  • DOI: 10.5194/angeo-36-633-2018
  • Peer Reviewed / Open Access
• [Presentation] Impact of interactive chemistry of stratospheric ozone on surface climate in paleoclimate simulations and future global warming projections (2019)
  • Author(s): Shigeo Yoden, S. Noda, K. Kodera, Y. Adachi, M. Deushi, A. Kitoh, R. Mizuta, S. Murakami, K. Yoshida
  • Organizer: 99th AMS Annual Meeting
  • Int'l Joint Research
• [Presentation] Three-dimensional minimal model of QBO-like oscillations in a stratosphere-troposphere coupled system under a radiative-moist convective quasi-equilibrium state (2019)
  • Author(s): Shigeo Yoden, Hoang-Hai Bui, Eriko Nishimoto
  • Organizer: 99th AMS Annual Meeting
  • Int'l Joint Research
• [Presentation] SUNRISE-DKIST-EUVSTと彩層・コロナモデリング (2019)
  • Author(s): 飯島陽久
  • Organizer: 太陽研連シンポジウム「太陽研究の現状と将来展望」
  • Invited
• [Presentation] Flux emergence simulation in a deep domain (2019)
  • Author(s): Hideyuki Hotta
  • Organizer: Flux emergence workshop 2019
  • Int'l Joint Research
• [Presentation] From solar dynamo to formation of sunspot (2019)
  • Author(s): Hideyuki Hotta, Haruhisa Iijima, Kanya Kusano
  • Organizer: MPPC meeting
  • Int'l Joint Research
• [Presentation] 黒点形成と太陽内部の磁場・熱対流構造の関係 (2019)
  • Author(s): 堀田英之
  • Organizer: 日本天文学会春季年会
• [Presentation] 雲南天文台麗江観測所コロナ観測状況 (2019)
  • Author(s): 萩野正興、桜井 隆、篠田一也、Yu Liu, Tengfei Song, Xuefei Zhang, Mingyu Zhao, Zhong Liu, 木村剛一、一本 潔、宮良碧、清水結花
  • Organizer: 日本天文学会春季年会
• [Presentation] 石灰岩堆積物を用いた新しい宇宙線復元手法について (2019)
  • Author(s): 宮原ひろ子
  • Organizer: 第9回太陽圏・宇宙線・気候変動研究会
• [Presentation] A parameter-sweep nudging experiment on the influence of vertical structure of environmental winds on deep moist convection (2018)
  • Author(s): Shigeo Yoden, Hoang-Hai Bui, Eriko Nishimoto
  • Organizer: AMS 33rd Conference on Hurricanes and Tropical Meteorology
  • Int'l Joint Research
• [Presentation] 最終氷期最盛期実験における成層圏化学フィードバックによる寒冷化抑制 (2018)
  • Author(s): 納多 哲史、小寺 邦彦、足立 恭将、出牛 真、鬼頭 昭雄、水田 亮、村上 茂教、吉田 康 平、余田 成男
  • Organizer: JpGU2018
• [Presentation] A Parameter-Sweep Nudging Experiment on the Influence of Vertical Structure of Environmental Winds on Deep Moist Convection (2018)
  • Author(s): Shigeo Yoden, Hoang-Hai Bui, Eriko Nishimoto
  • Organizer: 15th Annual Meeting of Asia Oceania Geoscience Society
  • Int'l Joint Research
• [Presentation] Thorough Survey of Zonal Mean Influence of the Stratospheric QBO on the Tropospheric Circulations and Moist Convection (2018)
  • Author(s): Shigeo Yoden, Eriko Nishimoto
  • Organizer: 15th Annual Meeting of Asia Oceania Geoscience Society
  • Int'l Joint Research
• [Presentation] Impact of interactive chemistry of stratospheric ozone in paleoclimate and global warming simulations (2018)
  • Author(s): KU-MRI PSTEP team(Shigeo Yosden, Satoshi Noda, Kunihiko Kodera, Yukimasa Adachi, Makoto Deushi, Akio Kitoh, Ryo Mizuta, Shigenori Murakami, and Kohei Yoshida
  • Organizer: COSPAR 2018
  • Int'l Joint Research / Invited
• [Presentation] Stratosphere-Troposphere Two-Way Dynamical Coupling in the Tropics through Organizations of Moist Convective Systems (2018)
  • Author(s): Shigeo Yoden, Hoang-Hai Bui, Eriko Nishimoto
  • Organizer: 1st International Conference on Tropical Meteorology and Atmospheric Sciences
  • Int'l Joint Research / Invited
• [Presentation] Stratosphere-troposphere dynamical coupling in the tropics (2018)
  • Author(s): Shigeo Yoden
  • Organizer: National Taiwan University - Kyoto University workshop on tropical meteorology
  • Int'l Joint Research / Invited
• [Presentation] A Series of Numerical Experiments on Stratoshere-Troposphere Two-Way Dynamical Coupling in the Tropics through Organizations of Moist Convective Systems (2018)
  • Author(s): Shigeo Yoden, Hoang-Hai Bui, Eriko Nishimoto
  • Organizer: SPARC General Assembly 2018
  • Int'l Joint Research
• [Presentation] Hierarchy of numerical model simulations on the equatorial QBO-like oscillations in the stratosphere-troposphere coupled system (2018)
  • Author(s): Shigeo Yoden
  • Organizer: AAPPS-DPP (2nd Asia-Pacific Conference on Plasma Physics)
  • Int'l Joint Research / Invited
• [Presentation] High Resolution Simulations of Solar Convection Zone and Dynamo (2018)
  • Author(s): H. Hotta, M. Rempel, H. Iijima, K. Kusano, T. Yokoyama
  • Organizer: AAPPS-DPP2018
  • Int'l Joint Research / Invited
• [Presentation] Solar and stellar convection and dynamo (2018)
  • Author(s): H. Hotta, M. Rempel, H. Iijima, K. Kusano, T. Yokoyama
  • Organizer: ITC27 & APPTC2018
  • Int'l Joint Research / Invited
• [Presentation] Calculation of solar convection zone with the reduced speed of sound technique (2018)
  • Author(s): H. Hotta, M. Rempel, H. Iijima, K. Kusano, T. Yokoyama
  • Organizer: IAU general assembly
  • Int'l Joint Research / Invited
• [Presentation] 太陽内部と表面をつなぐ大規模シミュレーション (2018)
  • Author(s): 堀田英之、飯島陽久、草野完也
  • Organizer: SGEPPS
  • Int'l Joint Research / Invited
• [Presentation] Science Objectives of Solar-C_EUVST (2018)
  • Author(s): Shinsuke Imada
  • Organizer: JPGU 2018
  • Int'l Joint Research / Invited
• [Presentation] Comparative Study of Energetic Particle Acceleration During Solar Flare and Terrestrial Substorm (2018)
  • Author(s): Shinsuke Imada
  • Organizer: AOGS 2018
  • Int'l Joint Research / Invited
• [Presentation] Predicting the solar-cycle activity based on the photospheric magnetic field (2018)
  • Author(s): H. Iijima, H. Hotta, S. Imada, K. Kusano, and D. Shiota
  • Organizer: Japan Geoscience Union Meeting
  • Int'l Joint Research / Invited
• [Presentation] Radiation MHD Simulations on Solar Chromospheric Jets (2018)
  • Author(s): H. Iijima and T. Yokoyama
  • Organizer: ASTRONUM-2018, the 13th International Conference on Numerical Modeling of Space Plasma Flows
  • Int'l Joint Research / Invited
• [Presentation] First comprehensive calculation of the whole solar convection zone (2018)
  • Author(s): Hideyuki Hotta, Haruhisa Iijima, Kanya Kusano
  • Organizer: 2018 SDO Science Workshop
  • Int'l Joint Research
• [Presentation] 黒点の拡散における太陽深部熱対流の影響 (2018)
  • Author(s): 堀田英之
  • Organizer: 日本天文学会秋季年会
• [Presentation] 太陽の対流層の底から表面までの一貫した計算 (2018)
  • Author(s): 堀田英之
  • Organizer: 日本流体力学会年会
• [Presentation] 太陽の対流層の底から彩層下部までの一貫した初めての計算 (2018)
  • Author(s): 堀田英之
  • Organizer: 日本地球惑星科学連合大会
• [Presentation] Intermodel differences in upwelling in the tropical tropopause layer among CMIP5 models (2018)
  • Author(s): Yoshida, K., R. Mizuta, and O. Arakawa
  • Organizer: 2018 AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] 大規模アンサンブル実験から見える成層圏突然昇温時の熱帯成層圏対流圏結合 (2018)
  • Author(s): 吉田康平, 水田亮
  • Organizer: 日本気象学会2018年度秋季大会
• [Presentation] Solar Rotational Cycle in Lightning Activity in Japan during the 18-19th Centuries (2018)
  • Author(s): Hiroko Miyahara
  • Organizer: 日本地球惑星科学連合大会
• [Presentation] High precision measurement of carbon-14 content in tree rings from the Maunder Minimum (2018)
  • Author(s): Hiroko Miyahara, F. Tokanai, T. Moriya
  • Organizer: 日本地球惑星科学連合大会
• [Presentation] Solar 27-day Rotational Period Detected in Wide-area Lightning Activity in Japan (2018)
  • Author(s): H. Miyahara, C. Higuchi, T. Terasawa, R. Kataoka, M. Sato, Y. Takahashi
  • Organizer: AOGS
  • Int'l Joint Research
• [Presentation] Variation of Relative Humidity in Central Japan During the Little Ice Age and its Relation to Solar Activity (2018)
  • Author(s): H. Miyahara, W. Sakashita, Y. Yokoyama, T. Aze, T. Nakatsuka
  • Organizer: AOGS
  • Int'l Joint Research
• [Book] シリーズ現代の天文学第10巻「太陽」改訂第2版 (2018)
  • Author(s): 桜井隆、小島正宜、小杉健郎、柴田一成（編）
  • Total Pages: 362
  • Publisher: 日本評論社
• [Funded Workshop] Hinode-13/IPELS2019 (2018)