内部磁気圏における高エネルギー荷電粒子とプラズマ波動の研究

• Project/Area Number: 22KF0169
• Project/Area Number (Other): 22F22329 (2022)
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Multi-year Fund (2023); Single-year Grants (2022)
• Section: 外国
• Review Section: Basic Section 17010:Space and planetary sciences-related
• Research Institution: Nagoya University
• Principal Investigator: 三好 由純 (2023) 名古屋大学, 宇宙地球環境研究所, 教授 (10377781)
• Co-Investigator(Kenkyū-buntansha): KUMAR SANDEEP 名古屋大学, 宇宙地球環境研究所, 外国人特別研究員
• Host Researcher: 三好 由純 (2022) 名古屋大学, 宇宙地球環境研究所, 教授 (10377781)
• Foreign Research Fellow: KUMAR SANDEEP 名古屋大学, 宇宙地球環境研究所, 外国人特別研究員
• Project Period (FY): 2023-03-08 – 2025-03-31
• Project Status: Granted (Fiscal Year 2023)
• Budget Amount: ¥2,300,000 (Direct Cost: ¥2,300,000); Fiscal Year 2023: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2022: ¥1,200,000 (Direct Cost: ¥1,200,000)
• Keywords: inner magnetosphere / ring current / electrons / Arase satellite / simulation / electron / ions

Outline of Research at the Start

This proposal will investigate the physical mechanisms responsible for transport, acceleration and loss of energetic particles in the radiation belt. This proposal will help in accurate forecast of space weather and will protect and provide a safe environment for human activity in space in future.

Outline of Annual Research Achievements

The objective of this research proposal is to investigate the wide range of energies (from keV to MeV) plasma and waves in the inner magnetosphere using observation from Arase satellite. Using the Arase satellite data for corotating interaction regions driven magnetic storms, we investigated statistically the spatial and temporal plasma pressure distribution of ions and electrons in the inner magnetosphere. Our study highlighted the importance of electron pressure to the ring current in dawn sector during moderate magnetic storms. The contribution of electron to the ring current has not been investigated much earlier. Our results indicate an important role of electrons in the ring current build up. It can help in the accuracy of the future models of ring current and space weather studies.

Current Status of Research Progress

3: Progress in research has been slightly delayed.

Reason

We investigated statistically moderate storms observed during Arase era (2017-2021) during solar minima. However, recently (2022 onwards) Arase observed many intense geomagnetic storms due to solar maxima. Therefore, we have a unique opportunity to study and compare the energetic particles in inner magnetosphere during different solar activity.

Strategy for Future Research Activity

Plasma pressure of ions and electrons in the inner magnetosphere plays an important role in plasma dynamics and generation of electric currents. The knowledge of plasma pressure in the inner magnetosphere is important as it reflects the source, transport and loss of different ions and electrons population. Earlier we established and published results of energetic particles in the inner magnetosphere during low solar activity. Recently, as solar activity increases, Arase observed many intense magnetic storms. Therefore, it will be very important to understand the inner magnetospheric evolution during different phases of solar activity. We will investigate and finalize the comparative study using Arase observations.

Research Products

• [Journal Article] Plasma Pressure Distribution of Ions and Electrons in the Inner Magnetosphere During CIR Driven Storms Observed During Arase Era (2023)
  • Author(s): Kumar Sandeep、Miyoshi Y.、Jordanova V. K.、Kistler L. M.、Park I.、Jun C.、Hori T.、Asamura K.、Shreedevi P. R.、Yokota S.、Kasahara S.、Kazama Y.、Wang S.‐Y.、Tam Sunny W. Y.、Chang Tzu‐Fang、Mitani T.、Higashio N.、Keika K.、Matsuoka A.、Imajo S.、Shinohara I.
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 128 Issue: 9
  • DOI: 10.1029/2023ja031756
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Statistical analysis of pressure and temperature distribution of ions and electrons in the inner magnetosphere during CIR and CME driven storms observed by Arase satellite (2023)
  • Author(s): Kumar Sandeep,Miyoshi Yoshizumi,Vania Jordanova,Kistler L M, Asamura Kazushi,Yokota Shoichiro,Kasahara Satoshi,Kazama Yoichi,S-Y Wang,Sunny W Y TAM,Mitani Takefumi,N Higashio,Keika Kunihiro,Hori Tomoaki,Jun Chae Woo,Matsuoka Ayako,Imajo Shun,Shinohara Iku
  • Organizer: SGEPSS
• [Presentation] Plasma pressure distribution of ions and electrons in the inner magnetosphere during CIR driven storms observed during Arase era (2023)
  • Author(s): Kumar Sandeep、Miyoshi Y.、Jordanova V. K.、Kistler L. M.、Park I.、Jun C.、Hori T.、Asamura K.、Shreedevi P. R.、Yokota S.、Kasahara S.、Kazama Y.、Wang S.‐Y.、Tam Sunny W. Y.、Chang Tzu‐Fang、Mitani T.、Higashio N.、Keika K.、Matsuoka A.、Imajo S.、Shinohara I.
  • Organizer: American Geophysical Union (AGU) Fall Meeting
  • Int'l Joint Research
• [Presentation] Plasma pressure distribution of ions and electrons in the inner magnetosphere during CIR and CME driven storms observed by Arase satellite (2022)
  • Author(s): Sandeep Kumar, Y. Miyoshi, and V. Jordanova et al.
  • Organizer: SGEPSS
• [Presentation] Plasma pressure distribution of ions and electrons in the inner magnetosphere during CIR and CME driven storms observed by Arase satellite (2022)
  • Author(s): Sandeep Kumar, Y. Miyoshi, and V. Jordanova et al.
  • Organizer: American Geophysical Union
  • Int'l Joint Research