Magnetospheric dynamics of outer planets

• Project/Area Number: 26287122
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Space and upper atmospheric physics
• Research Institution: Japan Aerospace EXploration Agency
• Principal Investigator: FUJIMOTO Masaki 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 教授 (30242811)
• Co-Investigator(Kenkyū-buntansha): 笠原 慧 東京大学, 大学院理学系研究科(理学部), 准教授 (00550500) ; 篠原 育 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 准教授 (20301723) ; 齋藤 義文 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 教授 (30260011)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000); Fiscal Year 2017: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2016: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2014: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
• Keywords: 木星磁気圏 / 衝撃波での粒子加速 / カッシーニ土星探査機 / 「ひさき」衛星 / 検出器信号読み出し系 / ASIC / 小面積真空之層SSD / APD / 衝撃波での粒子計測 / 小面積・真空乏層SSD / 惑星プラズマ・大気探査 / 小面積・深空乏層SSD / ガリレオ木星探査機

Outline of Final Research Achievements

(1) Relativistic electron acceleration in a high Mach number parallel shock: A high Mach number case was found in the Kronian bow shock observations and enabled opportunities of in-situ observations of plasma physics of high Mach number shocks. The high Mach number parallel shock showed relativistic acceleration of electrons. (2) Driver of the Jovian magnetospheric dynamics: Two competing ideas for the Jovian magnetospheric activities are plasma degassing from the innermost satellite of Io and variation in the solar wind. The JAXA Hisaki mission that provides continuous monitoring of the Jovian system enabled us to tell how the two factors collaborate to determine the Jovian auroral activity. (3) High energy particle detector onboard a Jupiter mission: Light-weight in-situ particle instruments that works under the harsh environment of the Jovian magnetosphere has been designed and its performance has been tested.

Research Products

• [Int'l Joint Research] ジョンズホプキンス大応用物理研究所/サウスウェスト研究所(米国)
• [Int'l Joint Research] インペリアル・カレッジ(英国)
• [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 Issue: 15 Pages: 7643-7652
  • DOI: 10.1002/2017gl073029
  • Peer Reviewed / Open Access / 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 Issue: 10 Pages: 4523-4531
  • DOI: 10.1002/2017gl072912
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Radial variation of sulfur and oxygen ions in the Io plasma torus as deduced from remote observations by Hisaki, Journal of Geophysical Research (2017)
  • Author(s): Yoshioka, K., F. Tsuchiya, T. Kimura, M. Kagitani, G. Murakami, A. Yamazaki, M. Kuwabara, F. Suzuki, R. Hikida, I. Yoshikawa, and M. Fujimoto, F. Bagenal
  • Journal Title: Journal of Geophysical Research Volume: 122 Issue: 3 Pages: 2999-3012
  • DOI: 10.1002/2016ja023691
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Suprathermal Electrons at Saturn's Bow Shock, (2016)
  • Author(s): Masters, A.; Sulaiman, A. H.; Sergis, N.; Stawarz, L.; Fujimoto, M.; Coates, A. J.; Dougherty, M. K.,
  • Journal Title: The Astrophysical Journal, Volume: Volume 826, Issue: 1 Pages: 48-48
  • DOI: 10.3847/0004-637x/826/1/48
• [Journal Article] Characteristics of solar wind control on Jovian UV auroral activity deciphered by long-term Hisaki EXCEED observations: Evidence of preconditioning of the magnetosphere? (2016)
  • Author(s): Kita, H.; Kimura, T.; Tao, C.; Tsuchiya, F.; Misawa, H.; Sakanoi, T.; Kasaba, Y.; Murakami, G.; Yoshioka, K.; Yamazaki, A.; Yoshikawa, I.; Fujimoto, M.
  • Journal Title: Geophys, Res. Lett. Volume: 43 Issue: 13 Pages: 6790-6798
  • DOI: 10.1002/2016gl069481
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Properties of hot electrons in the Jovian inner magnetosphere deduced from extended observations of the Io Plasma Torus (2016)
  • Author(s): Yoshikawa, I.; Yoshioka, K.; Murakami, G.; Suzuki, F.; Hikida, R.; Yamazaki, A.; Kimura, T.; Tsuchiya, F.; Kagitani, M.; Sakanoi, T.; Uemizu, K.; Tao, C.; Nozawa, H.; Kasaba, Y.; Fujimoto, M.
  • Journal Title: Geophys. Res. Lett. Volume: 43 Issue: 22 Pages: 11552-11557
  • DOI: 10.1002/2016gl070706
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Quasiperpendicular High Mach Number Shocks. (2015)
  • Author(s): H. Sulaiman, A. Masters,K. Dougherty, D. Burgess, M. Fujimoto, and G.B. Hospodarsky
  • Journal Title: Phys. Rev. Lett. Volume: 115 Issue: 12
  • DOI: 10.1103/physrevlett.115.125001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ransient internally-driven aurora at Jupiter discovered by Hisaki and Hubble Space Telescope (2015)
  • Author(s): Tomoki KIMURA, S. V. Badman, C. Tao, K. Yoshioka, G. Murakami, A. Yamazaki, F. Tsuchiya, B. Bonfond, A. J. Steffl, A. Masters, S. Kasahara, H. Hasegawa, I. Yoshikawa, M. Fujimoto, and J. T. Clarke
  • Journal Title: Geophys. Res. Lett. Volume: 42 Issue: 6 Pages: 1662-1668
  • DOI: 10.1002/2015gl063272
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Can magnetopause reconnection drive Saturn's magnetosphere? (2014)
  • Author(s): Masters, A., M. Fujimoto, H. Hasegawa, C. T. Russell, A. J. Coates, and M. K. Dougherty
  • Journal Title: Geophys. Res. Lett. Volume: 41 Issue: 6 Pages: 1862-1868
  • DOI: 10.1002/2014gl059288
  • Peer Reviewed / Open Access
• [Presentation] Temperature Anisotropy Enables Reconnection to Be Triggered in a Thick Current Sheet (2017)
  • Author(s): Masaki FUJIMOTO, Kenya SHIMIZU, Iku SHINOHARA
  • Organizer: Asia Oceania Geosciences Society 14th Annual Meeting
  • Int'l Joint Research
• [Presentation] Characteristics of solar wind control on Jovian UV auroral activity obtained from Hisaki EXCEED and ground-based observation (2017)
  • Author(s): 北 元, 木村 智樹, 垰 千尋, 土屋 史紀, 山崎 敦, 吉岡 和夫, 三澤 浩昭, 坂野井 健, 笠羽 康正, 吉川 一朗, 藤本 正樹
  • Organizer: 日本地球惑星科学連合2017年大会（JpGU-AGU共同大会2017）
• [Presentation] Jupiter’s auroras during the Juno approach phase as observed by the Hubble Space Telescope (2016)
  • Author(s): Jonathan D Nichols John T Clarke Glenn S Orton Stanley W H Cowley Emma J Bunce Tom Stallard Sarah Victoria Badman Denis C Grodent Bertrand Bonfond Katerina Radioti Jean-Claude M C Gerard Randy Gladstone Fran Bagenal John E P Philip W Valek Robert W Ebert David J McComas Barry Mauk Ichiro YoshikawaMasaki Fujimoto
  • Organizer: AGU
  • Place of Presentation: サンフランシスコ、アメリカ合衆国
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Cassini Observations of Saturn’s High-Mach Number Bow Shock (2016)
  • Author(s): Adam Masters Ali Sulaiman Nick Sergis Lukasz Stawarz Masaki Fujimoto Andrew J Coates Michele Karen Dougherty
  • Organizer: AGU
  • Place of Presentation: サンフランシスコ、アメリカ合衆国
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Co-evolution of upstream waves and accelerated ions at parallel shocks (2016)
  • Author(s): Tooru Sugiyama Masaki Fujimoto
  • Organizer: AGU
  • Place of Presentation: サンフランシスコ、アメリカ合衆国
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Triggering of explosive reconnection in a thick current sheet by temperature anisotropy boosted tearing mode (2016)
  • Author(s): Kenya Shimizu Masaki Fujimoto Iku Shinohara
  • Organizer: AGU
  • Place of Presentation: サンフランシスコ、アメリカ合衆国
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Less current sheet thinning, more temperature anisotropy (2016)
  • Author(s): Iku Shinohara Kenya Shimizu Masaki Fujimoto
  • Organizer: AGU
  • Place of Presentation: サンフランシスコ、アメリカ合衆国
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Solar wind influence on the Jovian inner magnetosphere observed by Hisaki/EXCEED (2015)
  • Author(s): Go Murakami , Kazuo Yoshioka, Atsushi Yamazaki, Fuminori Tsuchiya, Tomoki Kimura, Chihiro Tao, Masato Kagitani, Takeshi Sakanoi, Kazunori Uemizu, Yasumasa Kasaba, Masaki Fujimoto
  • Organizer: AGU 2015
  • Place of Presentation: サンフランシスコ
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] Plasma Dynamics in the Jovian Inner Magnetosphere; Observation from the EUV Spectroscope, EXCEED, (2015)
  • Author(s): Kazuo YOSHIOKA, Go MURAKAMI, Tomoki KIMURA, Atsushi YAMAZAKI, Fuminori TSUCHIYA, Masato KAGITANI, Takeshi SAKANOI, Yasumasa KASABA, Masaki FUJIMOTO, Ichiro YOSHIKAWA
  • Organizer: AOGS 2015
  • Place of Presentation: シンガポール
  • Year and Date: 2015-08-02
  • Int'l Joint Research
• [Presentation] 6 Variations of Dawn-Dusk Asymmetry in Io Plasma Torus Detected by HISAKI/EXCEED, (2015)
  • Author(s): Go MURAKAMI, Kazuo YOSHIOKA, Tomoki KIMURA, Atsushi YAMAZAKI1, Fuminori TSUCHIYA, Masato KAGITANI, Chihiro TAO, Ichiro YOSHIKAWA, Masaki FUJIMOTO,
  • Organizer: AOGS 2015
  • Place of Presentation: シンガポール
  • Year and Date: 2015-08-02
  • Int'l Joint Research
• [Presentation] Plasma Dynamics in the Jovian Inner Magnetosphere; Observation from the EUV Spectroscope, EXCEED (2015)
  • Author(s): Kazuo YOSHIOKA, Go MURAKAMI, Tomoki KIMURA, Atsushi YAMAZAKI, Fuminori TSUCHIYA, Masato KAGITANI, Takeshi SAKANOI, Yasumasa KASABA, Masaki FUJIMOTO, Ichiro YOSHIKAWA,
  • Organizer: AOGS 2015
  • Place of Presentation: シンガポール
  • Year and Date: 2015-08-02
  • Int'l Joint Research
• [Presentation] 無衝突衝撃波探査衛星のサイエンス (2015)
  • Author(s): 天野 孝伸 ; 星野 真弘 ; 斎藤 義文 ; 藤本 正樹;
  • Organizer: JpGU 2015
  • Place of Presentation: 幕張
  • Year and Date: 2015-05-24
• [Presentation] In-situ observations of magnetic reconnection in the Jovian nightside magnetosphere (2014)
  • Author(s): Satoshi Kasahara, et al., incl. M. Fujimoto
  • Organizer: AGU
  • Place of Presentation: Moscone Center/SanFransisco
  • Year and Date: 2014-12-15 – 2014-12-19
  • Invited
• [Presentation] Distinguished Lecture: Comparative Magnetospheric Study: Now the Time (2014)
  • Author(s): Masaki Fujimoto
  • Organizer: AOGS
  • Place of Presentation: 札幌ロイトンホテル
  • Year and Date: 2014-07-28 – 2014-08-01
  • Invited
• [Presentation] Dependence of Jovian Magnetopause Location on Solar Wind Dynamic Pressure (2014)
  • Author(s): KITAGAWA, Hirotaka; KASAHARA, Satoshi; TAO, Chihiro; KIMURA, Tomoki; FUJIMOTO, Masaki
  • Organizer: JpGU
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2014-04-28 – 2014-05-02