Scattering of Radiation Belt Electrons by Fast Magnetosonic Waves: Considering the Kinetic Effects
| Title: | Scattering of Radiation Belt Electrons by Fast Magnetosonic Waves: Considering the Kinetic Effects |
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| Authors: | Fei Yao, Kaijun Liu, Xiongdong Yu, Yan Wang, Ying Xiong, Shuai Zhang |
| Source: | Geophysical Research Letters, Vol 50, Iss 8, Pp n/a-n/a (2023) |
| Publisher Information: | Wiley, 2023. |
| Publication Year: | 2023 |
| Collection: | LCC:Geophysics. Cosmic physics |
| Subject Terms: | fast magnetosonic waves, kinetic dispersion relation, cold plasma dispersion relation, quasi‐linear diffusion coefficient, phase speed, group speed, Geophysics. Cosmic physics, QC801-809 |
| More Details: | Abstract When assessing the scattering of radiation belt electrons by fast magnetosonic (MS) waves, it is traditionally assumed that the waves follow the MS/whistler branch of the cold plasma dispersion relation (CPDR) in magnetohydrodynamics. However, MS waves are essentially ion Bernstein modes following a distinct kinetic dispersion relation. This study calculates the MS wave‐induced electron diffusion rates with the kinetic dispersion relation for the first time and compares the results with that obtained with the CPDR. It is found that the kinetic effects lead to a lower minimum resonant energy around 100 eV and a broader resonant pitch angle range. Kinetic effects also result in power spectral density attenuation when transforming wave frequency spectra into wavenumber spectra, so the diffusion rates are overall smaller than the ones obtained using the CPDR. Our results demonstrate that kinetic effects can significantly affect the role that MS waves play in the radiation belt dynamics. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1944-8007 0094-8276 |
| Relation: | https://doaj.org/toc/0094-8276; https://doaj.org/toc/1944-8007 |
| DOI: | 10.1029/2023GL103292 |
| Access URL: | https://doaj.org/article/ce9a8f09dc634d41839d1ccc6fd5a2a7 |
| Accession Number: | edsdoj.9a8f09dc634d41839d1ccc6fd5a2a7 |
| Database: | Directory of Open Access Journals |
| ISSN: | 19448007 00948276 |
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| DOI: | 10.1029/2023GL103292 |
| Published in: | Geophysical Research Letters |
| Language: | English |