2023 Fiscal Year Research-status Report
電磁イオンサイクロトロン波動によるイオン散乱に対する電離圏の効果
| Project/Area Number |
22KF0167
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| Allocation Type | Multi-year Fund |
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| Research Institution | Nagoya University |
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Principal Investigator |
三好 由純 名古屋大学, 宇宙地球環境研究所, 教授 (10377781)
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| Co-Investigator(Kenkyū-buntansha) |
PORUNAKATU SHREEDEVI 名古屋大学, 宇宙地球環境研究所, 外国人特別研究員
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| Project Period (FY) |
2023-03-08 – 2025-03-31
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| Keywords | simulation / inner magnetosphere / ring current / plasma waves |
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| Outline of Annual Research Achievements |
RAM-SCB simulations were conducted to understand the impact of proton precipitation caused by wave-particle interactions on the ionospheric dynamics during geomagnetic stormtime. The simulations show that localized proton precipitation resulting from EMIC waves resulted in localized enhancement of conductivity in the evening side. This further gave rise to high speed westward flow in the ionosphere similar to the Subauroral Polarization Streams (SAPS). The study further highlights the importance of proton precipitation in modulating the ionospheric dynamics. Additionally, the sources and mechanisms of generation of EMIC waves in the inner magnetosphere during periods of solar wind dynamic pressure enhancement and their subsequent impact on the ionosphere are studied using the satellite/ground measurements.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
We encountered some challenges while integrating WPI into the standalone RAM-SCB. We will continue our data-model comparison as soon as we resolve the issues with the integration of WPI in the model. We're in the process of preparing a manuscript for the simulation study on SAPS.
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| Strategy for Future Research Activity |
The results of the simulation study conducted to understand the impact of proton precipitation on the ionospheric dynamics will be submitted to Geophysical Research Letters. The results will also be presented in the upcoming conferences (AGU, SGEPSS).
As for the second study on the mechanisms of generation of EMIC waves in the inner magnetosphere during periods of solar wind dynamic pressure enhancement and their subsequent impact on the ionosphere, the data analysis is complete. The simulation results from the model will be compared with the satellite and ground-based measurements.
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| Causes of Carryover |
予定していた出張を見合わせたため次年度使用が生じたが、次年度に成果発表のための出張を行う予定である。
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[Presentation] Proton precipitation at sub-auroral latitudes and its association to EMIC waves: Global modeling and multi instrument observations2023
Author(s)
Shreedevi P R, Yiqun Yu, Yoshizumi Miyoshi, Xingbin Tian, Sandeep Kumar, Minghui Zhu, Satoko Nakamura, Chae-Woo Jun, Masafumi Shoji, Kazuo Shiokawa, Vania Jordanova, T. Hori, K.Asamura, I. Shinohara, S. Yokota, S. Kasahara, K.Keika, A. Matsuoka , Martin Connors, Akira Kadokura
Organizer
URSI
Int'l Joint Research
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