Study on Ion cyclotron wave particle interaction in multi-dimensional space

• Project/Area Number: 17K14402
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Space and upper atmospheric physics
• Research Institution: Nagoya University
• Principal Investigator: Shoji Masafumi 名古屋大学, 宇宙地球環境研究所, 特任助教 (80722082)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 波動粒子相互作用 / 地球磁気圏 / プラズマ波動 / プラズマ波動粒子相互作用 / 内部磁気圏 / 非線形波動粒子相互作用 / ジオスペース / 超高層物理学

Outline of Final Research Achievements

In the inner magnetosphere, a few Hz frequency wave, so-called electromagnetic ion cycrotron emission, with frequency drift causes drastic change of the relativistic electron and highly energetic proton distributions. In-situ energy transfer between the wave and plasma particle which is theoretically suggested has not been detected. We performed real-scale simulations to find the condition of the nonlinear wave generation and spatial and temporal distribution, collaborating with the spacecraft observation analysis. The modulation of the energetic ion distribution function and resulting contribution to the magnetospheric plasma dynamics by the electromagnetic ion cyclotron waves are also studied.

Academic Significance and Societal Importance of the Research Achievements

非線形理論で提唱されるその粒子散乱効率及び成長率は線形的なアプローチよりも遥かに効率が良いERG衛星の重要な観測対象である、電子スケールの波動のコーラス放射に対しても同様のアプローチが可能であるため、国内外から注目されている研究課題である。申請者は国際的なデータ解析チームと、EMIC 放射の大規模シミュレーション結果と観測結果との融合解析手法を議論することによって、低周波非線形波動の放射線帯プラズマダイナミクスへの影響についての総合的な理解に貢献できる。

Research Products

• [Journal Article] Instantaneous Frequency Analysis on Nonlinear EMIC Emissions: Arase Observation (2018)
  • Author(s): Shoji Masafumi、Miyoshi Yoshizumi、Omura Yoshiharu、Kistler Lynn M.、Kasaba Yasumasa、Matsuda Shoya、Kasahara Yoshiya、Matsuoka Ayako、Nomura Reiko、Ishisaka Keigo、Kumamoto Atsushi、Tsuchiya Fuminori、Yagitani Satoshi、Teramoto Mariko、Asamura Kazushi、Takashima Takeshi、Shinohara Iku
  • Journal Title: Geophysical Research Letters Volume: 45 Issue: 24 Pages: 13199-13205
  • DOI: 10.1029/2018gl079765
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Direct measurements of two-way wave-particle energy transfer in a collisionless space plasma (2018)
  • Author(s): Kitamura N.、Kitahara M.、Shoji M.、Miyoshi Y.、Hasegawa H.、Nakamura S.、Katoh Y.、Saito Y.、Yokota S.、Gershman D. J.、Vinas A. F.、Giles B. L.、Moore T. E.、Paterson W. R.、Pollock C. J.、Russell C. T.、Strangeway R. J.、Fuselier S. A.、Burch J. L.
  • Journal Title: Science Volume: 361 Issue: 6406 Pages: 1000-1003
  • DOI: 10.1126/science.aap8730
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ion hole formation and nonlinear generation of Electromagnetic Ion Cyclotron waves: THEMIS observations (2017)
  • Author(s): Shoji, Masafumi., Y. Miyoshi, Y. Katoh et al.
  • Journal Title: Geophys. Res. Lett. Volume: 44 Issue: 17 Pages: 8730-8738
  • DOI: 10.1002/2017gl074254
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Nonlinear Generation Mechanism of EMIC Falling Tone Emissions (2017)
  • Author(s): Shoji Masafumi、Omura Yoshiharu
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 122 Issue: 10 Pages: 9924-9933
  • DOI: 10.1002/2017ja023883
  • Peer Reviewed
• [Presentation] Instantaneous frequency analysis on nonlinear EMIC emissions: Arase observation (2019)
  • Author(s): Masafumi Shoji, Yoshizumi Miyoshi, Yoshiharu Omura, Yasumasa Kasaba, Keigo Ishisaka, Shoya Matsuda, Yoshiya Kasahara, Satoshi Yagitani, Ayako Matsuoka, Mariko Teramoto, Reiko Nomura, Takeshi Takashima, and Iku Shinohara
  • Organizer: JpGU
  • Int'l Joint Research
• [Presentation] Direct detection of nonlinear generation process of electromagnetic ion cyclotron emissions observed by the Arase spacecraft (2019)
  • Author(s): M. Shoji, Y. Miyoshi, L. M. Kistler, K. Asamura, Y. Kasaba, S. Matsuda, Y. Kasahara, A. Matsuoka, M. Teramoto, T. Takashima, and I. Shinohara
  • Organizer: URSI-JRSM
  • Int'l Joint Research
• [Presentation] Nonlinear EMIC wave particle interaction analysis by THEMIS observation (2018)
  • Author(s): Masafumi Shoji, Yoshizumi Miyoshi, Yuto Katoh, Kunihiro Keika, Vassilis Angelopoulos, Satoshi Kasahara, Kazushi Asamura, Satoko Nakamura, and Yoshiharu Omura
  • Organizer: The 3rd PSTEP International Symposium
  • Int'l Joint Research / Invited
• [Presentation] Ion hole formation and nonlinear wave generation of EMIC wave: THEMIS observation (2018)
  • Author(s): Masafumi Shoji, Yoshizumi Miyoshi, Yuto Katoh, Kunihiro Keika, Vassilis Angelopoulos, Satoshi Kasahara, Kazushi Asamura, Satoko Nakamura, and Yoshiharu Omura
  • Organizer: JpGU Meeting
  • Int'l Joint Research / Invited
• [Presentation] Instantaneous frequency analysis on nonlinear EMIC emissions: Arase observation (2018)
  • Author(s): Masafumi Shoji, Yoshizumi Miyoshi, Yoshiharu Omura, Yasumasa Kasaba, Keigo Ishisaka, Shoya Matsuda, Yoshiya Kasahara, Satoshi Yagitani, Ayako Matsuoka, Mariko Teramoto, Reiko Nomura, Takeshi Takashima, and Iku Shinohara
  • Organizer: AT-RASC
  • Int'l Joint Research
• [Presentation] Hybrid Simulations of Nonlinear Interactions Between EMIC Waves and Plasmas in the Magnetosphere (2018)
  • Author(s): Masafumi Shoji, Yoshiharu Omura
  • Organizer: ISSS13
  • Int'l Joint Research / Invited
• [Presentation] Ion hole formation and nonlinear wave generation of EMIC wave: THEMIS observation (2018)
  • Author(s): Masafumi Shoji, Yoshizumi Miyoshi, Yuto Katoh, Kunihiro Keika, Vassilis Angelopoulos, Satoshi Kasahara, Kazushi Asamura, Satoko Nakamura, and Yoshiharu Omura
  • Organizer: CLUSTER-THEMIS workshop
  • Int'l Joint Research / Invited
• [Presentation] Instantaneous frequency analysis on nonlinear EMIC emissions: Arase observation (2018)
  • Author(s): Masafumi Shoji, Yoshizumi Miyoshi, Yoshiharu Omura, Yasumasa Kasaba, Keigo Ishisaka, Shoya Matsuda, Yoshiya Kasahara, Satoshi Yagitani, Ayako Matsuoka, Mariko Teramoto, Reiko Nomura, Takeshi Takashima, and Iku Shinohara
  • Organizer: AGU fall meeting
  • Int'l Joint Research
• [Presentation] Instantaneous Frequency Analysis on Nonlinear EMIC Emissions: Arase Observation (2017)
  • Author(s): Masafumi Shoji, Yoshizumi Miyoshi, Yoshiharu Omura, Yasumasa Kasaba, Keigo Ishisaka, Shoya Matsuda, Yoshiya Kasahara, Satoshi Yagitani, Ayako Matsuoka, Mariko Teramoto, Takeshi Takashima, and Iku Shinohara
  • Organizer: AGU fall meeting
  • Int'l Joint Research
• [Presentation] Instantaneous Frequency Analysis on Nonlinear EMIC Emissions: Arase Observation (2017)
  • Author(s): Masafumi Shoji, Yoshizumi Miyoshi, Yoshiharu Omura, Yasumasa Kasaba, Keigo Ishisaka, Shoya Matsuda, Yoshiya Kasahara, Satoshi Yagitani, Ayako Matsuoka, Mariko Teramoto, Takeshi Takashima, and Iku Shinohara
  • Organizer: SGEPSS fall meeting
• [Presentation] Nonlinear generation mechanism of EMIC falling tone emissions (2017)
  • Author(s): Masafumi Shoji and Yoshiharu Omura
  • Organizer: URSI GASS
  • Int'l Joint Research
• [Presentation] Nonlinear generation mechanism of EMIC falling tone emissions (2017)
  • Author(s): Masafumi Shoji and Yoshiharu Omura
  • Organizer: JpGU
  • Int'l Joint Research