Xing Cao, Binbin Ni, Danny Summers, Yuri Y. Shprits, Xudong Gu, Song Fu, Yuequn Lou, Yang Zhang, Xin Ma, Wenxun Zhang, He Huang, Juan Yi
- Electromagnetic ion cyclotron waves have long been recognized to play a crucial role in the dynamic loss of ring current protons. While the field-aligned propagation approximation of electromagnetic ion cyclotron waves was widely used to quantify the scattering loss of ring current protons, in this study, we find that the wave normal distribution strongly affects the pitch angle scattering efficiency of protons. Increase of peak normal angle or angular width can considerably reduce the scattering rates of <= 10 keV protons. For >10 keV protons, the field-aligned propagation approximation results in a pronounced underestimate of the scattering of intermediate equatorial pitch angle protons and overestimates the scattering of high equatorial pitch angle protons by orders of magnitude. Our results suggest that the wave normal distribution of electromagnetic ion cyclotron waves plays an important role in the pitch angle evolution and scattering loss of ring current protons and should be incorporated in future global modeling of ringElectromagnetic ion cyclotron waves have long been recognized to play a crucial role in the dynamic loss of ring current protons. While the field-aligned propagation approximation of electromagnetic ion cyclotron waves was widely used to quantify the scattering loss of ring current protons, in this study, we find that the wave normal distribution strongly affects the pitch angle scattering efficiency of protons. Increase of peak normal angle or angular width can considerably reduce the scattering rates of <= 10 keV protons. For >10 keV protons, the field-aligned propagation approximation results in a pronounced underestimate of the scattering of intermediate equatorial pitch angle protons and overestimates the scattering of high equatorial pitch angle protons by orders of magnitude. Our results suggest that the wave normal distribution of electromagnetic ion cyclotron waves plays an important role in the pitch angle evolution and scattering loss of ring current protons and should be incorporated in future global modeling of ring current dynamics.…
MetadatenVerfasserangaben: | Xing CaoORCiD, Binbin NiORCiD, Danny SummersORCiD, Yuri Y. ShpritsORCiD, Xudong GuORCiD, Song FuORCiD, Yuequn LouORCiD, Yang Zhang, Xin Ma, Wenxun ZhangORCiD, He HuangORCiD, Juan YiORCiD |
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DOI: | https://doi.org/10.1029/2018GL081550 |
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ISSN: | 0094-8276 |
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ISSN: | 1944-8007 |
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Titel des übergeordneten Werks (Englisch): | Geophysical research letters |
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Verlag: | American Geophysical Union |
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Verlagsort: | Washington |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Datum der Erstveröffentlichung: | 11.01.2019 |
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Erscheinungsjahr: | 2019 |
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Datum der Freischaltung: | 20.04.2021 |
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Band: | 46 |
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Ausgabe: | 2 |
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Seitenanzahl: | 9 |
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Erste Seite: | 590 |
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Letzte Seite: | 598 |
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Fördernde Institution: | NSFCNational Natural Science Foundation of China [41674163, 41474141, 41204120]; Hubei Province Natural Science Excellent Youth Foundation [2016CFA044]; Natural Sciences and Engineering Research Council of CanadaNatural Sciences and Engineering Research Council of Canada |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer Review: | Referiert |
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