Direct Evidence for Electron Pitch Angle Scattering Driven by Electrostatic Cyclotron Harmonic Waves

Abstract Electrostatic Cyclotron Harmonic (ECH) waves have been considered a potential cause of pitch angle scattering of electrons in the energy range from a few hundred eV to tens of keV. Theoretical studies have suggested that scattering by ECH waves is enhanced at lower pitch angles near the loss cone. Due to the insufficient angular resolution of particle detectors, it has been a great challenge to reveal ECH‐driven scattering based on electron measurements. This study reports on variations in electron pitch angle distributions associated with ECH wave activity observed by the Arase satellite. The variation is characterized by a decrease in fluxes near the loss cone, and energy and pitch angle dependence of the flux decrease is consistent with the region of enhanced pitch angle scattering rates predicted by the quasi‐linear diffusion theory. This study provides direct evidence for energy‐pitch angle dependence of pitch angle scattering driven by ECH waves.

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Publication Details

Journal
Geophysical Research Letters
Published
2025-02-28
DOI
https://doi.org/10.1029/2024gl113188
Citations
3
Primary Topic
Ionosphere and magnetosphere dynamics
Type
article
Field-Weighted Citation Impact
3.46

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Direct Evidence for Electron Pitch Angle Scattering Driven by Electrostatic Cyclotron Harmonic Waves

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Direct Evidence for Electron Pitch Angle Scattering Driven by Electrostatic Cyclotron Harmonic Waves

Yoshiya Kasahara, Shoya Matsuda, Iku Shinohara, Kazuhiro Yamamoto, Fuminori Tsuchiya, Shoichiro Yokota, M. Teramoto, Satoshi Kurita, K. Keika, Atsushi Kumamoto, Tomoaki Hori, Ayako Matsuoka, Satoshi Kasahara, Yoshizumi Miyoshi
article en
3 citations

Abstract

Abstract Electrostatic Cyclotron Harmonic (ECH) waves have been considered a potential cause of pitch angle scattering of electrons in the energy range from a few hundred eV to tens of keV. Theoretical studies have suggested that scattering by ECH waves is enhanced at lower pitch angles near the loss cone. Due to the insufficient angular resolution of particle detectors, it has been a great challenge to reveal ECH‐driven scattering based on electron measurements. This study reports on variations in electron pitch angle distributions associated with ECH wave activity observed by the Arase satellite. The variation is characterized by a decrease in fluxes near the loss cone, and energy and pitch angle dependence of the flux decrease is consistent with the region of enhanced pitch angle scattering rates predicted by the quasi‐linear diffusion theory. This study provides direct evidence for energy‐pitch angle dependence of pitch angle scattering driven by ECH waves.

Geophysical Research LettersVol. 52(5)
Kanazawa University (JP), 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), The University of Osaka (JP)
Japan Society for the Promotion of Science
Openalex Percentile: Top 9%
Ionosphere and magnetosphere dynamics
3.46
DOIOpen Access PDFOpenAlex
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