Xing Cao, Binbin Ni, Danny Summers, Yuri 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.…
MetadatenAuthor details: | Xing CaoORCiD, Binbin NiORCiD, Danny SummersORCiD, Yuri ShpritsORCiDGND, 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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Title of parent work (English): | Geophysical research letters |
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Publisher: | American Geophysical Union |
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Place of publishing: | Washington |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2019/01/11 |
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Publication year: | 2019 |
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Release date: | 2021/04/20 |
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Volume: | 46 |
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Issue: | 2 |
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Number of pages: | 9 |
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First page: | 590 |
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Last Page: | 598 |
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Funding 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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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer review: | Referiert |
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