In Situ Observations of the Influence of Nonlinear EMIC Waves on Relativistic Electrons in the Outer Radiation Belt

Abstract This study demonstrates the influence of electromagnetic ion cyclotron (EMIC) rising‐tone emissions on relativistic electrons in the inner magnetosphere using data obtained from the Van Allen Probes and Arase satellites. We find that the intense EMIC rising‐tone emissions occur during the increase in the solar wind pressures, creating favorable conditions for triggering nonlinear wave growth. The strong flux drop‐out of relativistic electrons in the parallel directions of the magnetic field, with energies of 0.2–4 MeV, was associated with the wave activity. We calculated the nonlinear triggering conditions and the minimum resonant energy of relativistic electrons interaction with EMIC waves, based on our observations. We conclude that EMIC rising‐tone emissions contribute not only to the rapid loss of MeV electrons through EMIC wave‐particle interactions while extending the resonance energy to a few MeV by broadening bandwidth via nonlinear wave growth but also to interactions with sub‐MeV electrons through the nonresonant effect.

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Publication Details

Journal
Geophysical Research Letters
Published
2025-05-03
DOI
https://doi.org/10.1029/2024gl113855
Citations
1
Primary Topic
Ionosphere and magnetosphere dynamics
Type
article
Field-Weighted Citation Impact
1.15
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article

In Situ Observations of the Influence of Nonlinear EMIC Waves on Relativistic Electrons in the Outer Radiation Belt

Takefumi Mitani, Jacob Bortnik, Iku Shinohara, Kazuhiro Yamamoto et al.
1 citations
Geophysical Research Letters
Ionosphere and magnetosphere dynamics
1.15
article

In Situ Observations of the Influence of Nonlinear EMIC Waves on Relativistic Electrons in the Outer Radiation Belt

Takefumi Mitani, Jacob Bortnik, Iku Shinohara, Kazuhiro Yamamoto, M. Teramoto, L. R. Lyons, Khan‐Hyuk Kim, Tomoaki Hori, Ayako Matsuoka, Nana Higashio, Chae‐Woo Jun, Yoshizumi Miyoshi, Takeshi Takashima
article en
1 citations

Abstract

Abstract This study demonstrates the influence of electromagnetic ion cyclotron (EMIC) rising‐tone emissions on relativistic electrons in the inner magnetosphere using data obtained from the Van Allen Probes and Arase satellites. We find that the intense EMIC rising‐tone emissions occur during the increase in the solar wind pressures, creating favorable conditions for triggering nonlinear wave growth. The strong flux drop‐out of relativistic electrons in the parallel directions of the magnetic field, with energies of 0.2–4 MeV, was associated with the wave activity. We calculated the nonlinear triggering conditions and the minimum resonant energy of relativistic electrons interaction with EMIC waves, based on our observations. We conclude that EMIC rising‐tone emissions contribute not only to the rapid loss of MeV electrons through EMIC wave‐particle interactions while extending the resonance energy to a few MeV by broadening bandwidth via nonlinear wave growth but also to interactions with sub‐MeV electrons through the nonresonant effect.

Geophysical Research LettersVol. 52(9)
University of California, Los Angeles (US), Kyushu Institute of Technology (JP), Kyoto University (JP), Japan Aerospace Exploration Agency (JP), Kyung Hee University (KR), Institute of Space and Astronautical Science (JP), Nagoya University (JP)
Openalex Percentile: Top 20%
Ionosphere and magnetosphere dynamics
1.15
DOIOpen Access PDFOpenAlex
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