宇宙望遠鏡と探査機の連携観測による回転磁気圏のエネルギー解放・輸送過程の解明

2017 Fiscal Year Research-status Report

• Project/Area Number: 16K17812
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: 木村 智樹 国立研究開発法人理化学研究所, 仁科加速器研究センター, 基礎科学特別研究員 (50578804)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 木星 / 磁気圏 / エネルギー解放・輸送 / オーロラ / プラズマ

Outline of Annual Research Achievements

本研究では、数10MeVに至る高エネルギー粒子加速を駆動する、木星磁気圏の自励的な電磁エネルギーの解放と輸送過程の解明を最終目的とする。研究代表者は、惑星分光観測衛星「ひさき」とハッブル宇宙望遠鏡による連携観測を初めて実施し、木星の高速自転と衛星イオのプラズマ供給が自励的に駆動する、内部駆動型の突発的オーロラ加速を発見した。

本研究では、２０１６年に観測開始した木星極域探査機Junoを新たに加え、世界初の遠隔－極域その場同時連携観測から、内部駆動型の粒子加速で鍵となる①自励的エネルギー解放と、②木星近傍へのエネルギー輸送過程を解明し、内部駆動形粒子加速の存在を実証する。

実施計画に則り、平成２９度は、２０１６年５月から８月に実施した、ひさき－ハッブル宇宙望遠鏡－Juno探査機の三者連携観測のデータを統合し、オーロラの時空間発展を網羅的に観測することで、問題の解明に取り組んだ。その結果、内部駆動形エネルギー解放に対応する、突発オーロラの開始時刻において、比較的高緯度のオーロラ構造が急速に拡大発展していることを発見した。その２０時間後、高緯度のオーロラは消失し、代わりに低緯度帯にオーロラが出現した。これは、木星磁場を介してオーロラと結合する磁気圏において、エネルギー解放・輸送が、木星の遠方から木星近傍に急速に発展した事を意味する。発展の位置・速度などを観測から見積もることに成功し、解放・輸送過程を制約しうる本質的情報を得ることが出来た。

Current Status of Research Progress

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

Reason

当初の研究計画に概ね沿って研究が進行でき、目的達成のための行程を順調に達成しているため。

Strategy for Future Research Activity

今後は、２０１６年８月以降に実施している、ひさきと、Junoの極域その場観測データを緊密に連携させ、今年度までの研究で示唆してきた、磁気圏におけるエネルギー解放・輸送の素過程を捉え、解放・輸送の物理シナリオの全容を明らかにしていく予定である。

Causes of Carryover

国際学会における成果発表旅費や、その他海外打ち合わせ用の旅費について、他研究プロジェクト等による、競争的旅費を獲得することが出来たため。次年度使用額は、平成３０年度の国際学会成果発表旅費や、その他海外打ち合わせ旅費として使用する。

Research Products

• [Journal Article] Response of Jupiter's Aurora to Plasma Mass Loading Rate Monitored by the Hisaki Satellite During Volcanic Eruptions at Io (2018)
  • Author(s): Tomoki Kimura, Y. Hiraki, C. Tao, F. Tsuchiya, P. Delamere, K. Yoshioka, G. Murakami, A. Yamazaki, H. Kita, S. V. Badman, K. Fukazawa, I. Yoshikawa, M. Fujimoto
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 123 Pages: 1885-1899
  • DOI: 10.1002/2017JA025029
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Jupiter's aurora observed with HST during Juno orbits 3 to 7 (2018)
  • Author(s): Denis, G., Bonfond, B., Yao, Z., G_rard, J.-C., Radioti, A., Dumont, M. B. Palmaerts, A. Adriani, S. V. Badman, E. J. Bunce, J. T. Clarke, J. E. P. Connerney, G. R. Gladstone, T. Greathouse, T. Kimura, W. S. Kurth, B. H. Mauk, D. J. McComas, J. D. Nichols, G. S. Orton, L. Roth, J. Saur, P. Valek
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 123 Pages: 3299-3319
  • DOI: 10.1002/2017JA025046
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Variation of Jupiter's Aurora Observed by Hisaki/EXCEED: 3. Volcanic Control of Jupiter's Aurora, Geophysical Research Letters (2018)
  • Author(s): Chihiro Tao, Tomoki Kimura, Fuminori Tsuchiya, Go Muirakami, Kazuo Yoshioka, Atsushi Yamazaki, Sarah V. Badman, Hiroaki Misawa, Hajime Kita, Yasumasa Kasaba, Ichiro Yoshikawa, Masaki Fujimoto
  • Journal Title: Geophysical Research Letters Volume: 45 Pages: 71-79
  • DOI: 10.1002/2017GL075814
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The time variation of atomic oxygen emission around Io during a volcanic event observed with Hisaki/EXCEED (2017)
  • Author(s): Ryoichi Koga, Fuminori Tsuchiya, Masato Kagitani, Takeshi Sakanoi, Mizuki Yoneda, Kazuo Yoshioka, Tomoki Kimura, Go Murakami, Atsushi Yamazaki, Ichiro Yoshikawa, H Todd Smith
  • Journal Title: Icarus Volume: 299 Pages: 300-307
  • DOI: 10.1016/j.icarus.2017.07.024
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Extreme Ultraviolet Spectra of Venusian Airglow Observed by EXCEED (2017)
  • Author(s): Nara, Yusuke, Ichiro Yoshikawa, Kazuo Yoshioka, Go Murakami, Tomoki Kimura, Atsushi Yamazaki, Fuminori Tsuchiya, Masaki Kuwabara, Naomoto Iwagami
  • Journal Title: Icarus Volume: in press Pages: 207-215
  • DOI: 10.1016/j.icarus.2017.10.028
  • Peer Reviewed
• [Journal Article] SOFTWARE-TYPE WAVE-PARTICLE INTERACTION ANALYZER (SWPIA) BY RPWI FOR JUICE: SCIENCE OBJECTIVES AND IMPLEMENTATION (2017)
  • Author(s): Y. Katoh, H. Kojima, K. Asamura, Y. Kasaba, F. Tsuchiya, Y. Kasahara, T. Imachi, H. Misawa, A. Kumamoto, S. Yagitani, K. Ishisaka, T. Kimura, M. Hikishima, Y. Miyoshi, M. Shoji, M. Kitahara, O. Santolik, Jan Bergman, Walter Puccio, Reine Gill, Martin Weiser, Walter Schmidt , Stas Barabash, and J.-E. Wahlund
  • Journal Title: Proceeding of 8th Planetary Radio Emission Conference Volume: in press Pages: in press
  • DOI: 0
  • Peer Reviewed
• [Journal Article] A FLUX COMPARISON OF NORTHERN AND SOUTHERN SATURN'S KILOMETRIC RADIO BURSTS DURING SOUTHERN SUMMER (2017)
  • Author(s): Y. Kasaba, T. Kimura, D. Maruno, A. Morioka, B. Cecconi, L. Lamy, C. M. Jackman, H. Misawa, T. Tsuchiya, A. Kumamoto
  • Journal Title: Proceeding of 8th Planetary Radio Emission Conference Volume: in press Pages: in press
  • DOI: 0
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Volcanic activity on Io and its influence on the dynamics of the Jovian magnetosphere observed by EXCEED/Hisaki in 2015 (2017)
  • Author(s): Ichiro Yoshikawa, Fumiharu Suzuki, Reina Hikida, Kazuo Yoshioka, Go Murakami, Fuminori Tsuchiya, Chihiro Tao, Atsushi Yamazaki, Tomoki Kimura, Hajime Kita, Hiromasa Nozawa and Masaki Fujimoto
  • Journal Title: Earth, Planets and Space Volume: 69 Pages: 110-121
  • DOI: 10.1186/s40623-017-0700-9
  • Peer Reviewed
• [Journal Article] Response of Jupiter's auroras to conditions in the interplanetary medium as measured by the Hubble Space Telescope and Juno (2017)
  • Author(s): J. D. Nichols, S. V. Badman, F. Bagenal, S. J. Bolton, B. Bonfond, E. J. Bunce, J. T., Clarke, J. E. P. Connerney, S.W. H. Cowley, R. W. Ebert, M. Fujimoto, J.-C. G_rard, G. R. Gladstone, D. Grodent, T. Kimura, et al.
  • Journal Title: Geophysical Research Letters Volume: 44 Pages: 7643_7652
  • DOI: 10.1002/2017GL073029
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Transient brightening of Jupiter’s aurora observed by the Hisaki satellite and Hubble Space Telescope during approach phase of the Juno spacecraft (2017)
  • Author(s): Tomoki Kimura, J. D. Nichols, R. L. Gray, C. Tao, G. Murakami, A. Yamazaki, S. V. Badman, F. Tsuchiya, K. Yoshioka, H. Kita, D. Grodent, G. Clark, I. Yoshikawa, and M. Fujimoto
  • Journal Title: Geophysical Research Letters Volume: 44 Pages: 4523_4531
  • DOI: 10.1002/2017GL072912
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Dawn-dusk difference of periodic oxygen EUV dayglow variations at Venus observed by Hisaki (2017)
  • Author(s): Masunaga, Kei, Kanako Seki, Naoki Terada, Fuminori Tsuchiya, Tomoki Kimura, Kazuo Yoshioka, Go Murakami, Atsushi Yamazaki, Chihiro Tao, Fran_ois Leblanc, and Ichiro Yoshikawa
  • Journal Title: Icarus Volume: 292 Pages: 102-110
  • DOI: 10.1016/j.icarus.2016.12.027
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 木星のオーロラ爆発 (2018)
  • Author(s): 木村智樹
  • Organizer: 磁気リコネクション・粒子加速勉強会
  • Invited
• [Presentation] Transient brightening of Jupiter's aurora observed by the Hisaki satellite and Hubble Space Telescope during approach phase of the Juno spacecraft (2017)
  • Author(s): Tomoki Kimura, J. D. Nichols, R. L. Gray, C. Tao, G. Murakami, A. Yamazaki, S. V. Badman, F. Tsuchiya, K. Yoshioka, H. Kita, et al.
  • Organizer: American Geophysical Union Fall meeting 2017
  • Int'l Joint Research / Invited
• [Presentation] Multi-wavelength observations of Jupiter's aurora during Juno’s cruise phase, Planetary Space Weather Meeting (2017)
  • Author(s): Tomoki Kimura
  • Organizer: Planetary Space Weather Meeting
  • Int'l Joint Research / Invited
• [Presentation] Development of Virtual Observatory Database for Hisaki (2017)
  • Author(s): Tomoki Kimura
  • Organizer: Planetary Space Weather Meeting
  • Int'l Joint Research / Invited
• [Presentation] Transient brightening of Jupiter’s aurora observed by the Hisaki satellite and Hubble Space Telescope during approach phase of the Juno spacecraft (2017)
  • Author(s): Tomoki Kimura
  • Organizer: National Astronomical Observatory of Japan Solar Seminar
  • Int'l Joint Research / Invited
• [Presentation] Transient brightening of Jupiter’s aurora observed by the Hisaki satellite and Hubble Space Telescope during approach phase of the Juno spacecraft (2017)
  • Author(s): Tomoki Kimura
  • Organizer: Magnetospheres of Outer Planets 2017
  • Int'l Joint Research / Invited
• [Presentation] Status report of Hisaki meta-database development (2017)
  • Author(s): Tomoki Kimura
  • Organizer: JSPS Sakura project meeting,
  • Int'l Joint Research
• [Presentation] Transient brightening of Jupiter’s aurora observed by the Hisaki satellite and Hubble Space Telescope during approach phase of the Juno spacecraft (2017)
  • Author(s): Tomoki Kimura, J. D. Nichols, R. L. Gray, C. Tao, G. Murakami, A. Yamazaki, S. V. Badman, F. Tsuchiya, K. Yoshioka, H. Kita, et al.
  • Organizer: International Space Science Institute
  • Int'l Joint Research
• [Presentation] Transient brightening of Jupiter’s aurora observed by the Hisaki satellite and Hubble Space Telescope during approach phase of the Juno spacecraft (2017)
  • Author(s): Tomoki Kimura, J. D. Nichols, R. L. Gray, C. Tao, G. Murakami, A. Yamazaki, S. V. Badman, F. Tsuchiya, K. Yoshioka, H. Kita, et al.
  • Organizer: European Planetary Science Congress
  • Int'l Joint Research
• [Presentation] Auroral explosion at Jupiter observed by the Hisaki satellite and Hubble Space Telescope during approaching phase of the Juno spacecraft (2017)
  • Author(s): Tomoki Kimura, J. D. Nichols, R. L. Gray, C. Tao, G. Murakami, A. Yamazaki, S. V. Badman, F. Tsuchiya, K. Yoshioka, H. Kita, et al.
  • Organizer: Japan Geoscience Union Meeting 2017
  • Int'l Joint Research
• [Presentation] 巨大惑星磁気圏研究の現状と将来展望 (2017)
  • Author(s): 木村智樹
  • Organizer: 第19回惑星圏研究会
  • Invited
• [Presentation] リモートセンシングと探査機その場観測の連携で取り組む回転惑星磁気圏のリコネクションと粒子加速 (2017)
  • Author(s): 木村智樹
  • Organizer: 磁気リコネクション・粒子加速勉強会
  • Invited
• [Presentation] Brightening of Jupiter's aurora observed by the Hisaki satellite and Hubble Space Telescope during Juno's approach phase (2017)
  • Author(s): 木村智樹, 垰千尋, 村上豪, 山崎敦,土屋史紀, 吉岡和夫, 北元, 吉川一朗, 藤本正樹
  • Organizer: 地球電磁気・地球惑星圏学会 第 142 回総会・講演会
• [Presentation] ひさき衛星による木星磁気圏観測とグローバルMHDシミュレーションの連携解析の概要 (2017)
  • Author(s): 木村 智樹, 深沢 圭一郎, 村上 豪, 北 元, 垰 千尋, 土屋 史紀
  • Organizer: 地球電磁気・地球惑星圏学会 第 142 回総会・講演会
• [Remarks] 木星オーロラの爆発的増光観測に成功－「ひさき」「ハッブル」「ジュノー」の国際連携による成果－
  • URL: http://www.riken.jp/pr/press/2017/20170523_1/