Statistical Survey of Loss Cone Electrons Observed In Situ in the Inner Magnetosphere

Abstract We report a statistical result of electrons inside the loss cone with energies of 67 eV–88 keV using electron measurements obtained in situ by the Arase satellite in the inner magnetosphere around the magnetic equator for 60 months. Loss cone electrons are found with a high occurrence probability from the nightside to the dawnside at approximately L = 6. For 641 eV–88 keV electrons, the high‐occurrence region shifts toward later magnetic local times (MLTs) with increasing loss cone electron energy. The spatial distribution of the occurrence probability around MLT = 22–3 at L = 5–6 is consistent with the calculated average resonance energy distribution of whistler mode chorus waves near the magnetic equator. These results suggest that pitch angle scattering driven by chorus waves plays the main role in electron precipitation in this region.

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Publication Details

Journal
Geophysical Research Letters
Published
2025-02-10
DOI
https://doi.org/10.1029/2024gl112948
Primary Topic
Ionosphere and magnetosphere dynamics
Type
article
Field-Weighted Citation Impact
0.00

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Statistical Survey of Loss Cone Electrons Observed In Situ in the Inner Magnetosphere

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Geophysical Research Letters
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Statistical Survey of Loss Cone Electrons Observed In Situ in the Inner Magnetosphere

Yoshiya Kasahara, Shoya Matsuda, Iku Shinohara, Kazuhiro Yamamoto, Fuminori Tsuchiya, Shoichiro Yokota, M. Teramoto, Kazushi Asamura, B.‐J. Wang, K. Keika, Atsushi Kumamoto, Sunny W. Y. Tam, Tomoaki Hori, Y. Kazama, T. F. Chang, Shiang‐Yu Wang, Satoshi Kasahara, Chae‐Woo Jun, Yoshizumi Miyoshi, Atsuki Shinbori, A. Matsuoka, R. Takahara
article en

Abstract

Abstract We report a statistical result of electrons inside the loss cone with energies of 67 eV–88 keV using electron measurements obtained in situ by the Arase satellite in the inner magnetosphere around the magnetic equator for 60 months. Loss cone electrons are found with a high occurrence probability from the nightside to the dawnside at approximately L = 6. For 641 eV–88 keV electrons, the high‐occurrence region shifts toward later magnetic local times (MLTs) with increasing loss cone electron energy. The spatial distribution of the occurrence probability around MLT = 22–3 at L = 5–6 is consistent with the calculated average resonance energy distribution of whistler mode chorus waves near the magnetic equator. These results suggest that pitch angle scattering driven by chorus waves plays the main role in electron precipitation in this region.

Geophysical Research LettersVol. 52(3)
Kanazawa University (JP), Institute of Astronomy and Astrophysics, Academia Sinica (TW), Tohoku University (JP), Kyushu Institute of Technology (JP), Kyoto University (JP), Japan Aerospace Exploration Agency (JP), Institute of Space and Astronautical Science (JP), Nagoya University (JP), The University of Tokyo (JP), National Cheng Kung University (TW), The University of Osaka (JP)
Academia Sinica, Ministry of Science and Technology, Taiwan, National Cheng Kung University, Japan Society for the Promotion of Science, Japan Aerospace Exploration Agency
Openalex Percentile: Top 99%
Ionosphere and magnetosphere dynamics
DOIOpen Access PDFOpenAlex
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