DOI: 10.1002/2016GL068921
论文题名: Fast dropouts of multi-MeV electrons due to combined effects of EMIC and whistler mode waves
作者: Mourenas D. ; Artemyev A.V. ; Ma Q. ; Agapitov O.V. ; Li W.
刊名: Geophysical Research Letters
ISSN: 0094-9033
EISSN: 1944-8764
出版年: 2016
卷: 43, 期: 9 起始页码: 4155
结束页码: 4163
语种: 英语
英文关键词: dropout
; EMIC
; precipitations
; radiation belts
; whistler
Scopus关键词: Earth atmosphere
; Electrons
; Magnetoplasma
; Precipitation (chemical)
; Radiation belts
; Analytical estimates
; Dropout
; Dynamic variability
; EMIC
; Outer radiation belt
; Pitch-angle scattering
; Relativistic electron
; Whistler
; Atmospherics
; electron density
; plasma
; precipitation (chemistry)
; radiation balance
; wave action
; wave scattering
英文摘要: We investigate how whole populations of 2-6 MeV electrons can be quickly lost from the Earth's outer radiation belt at L= 3-6 through precipitation into the atmosphere due to quasi-linear pitch angle scattering by combined electromagnetic ion cyclotron (EMIC) and whistler mode waves of realistic intensities occurring at the same or different local times. We provide analytical estimates of the corresponding relativistic electron lifetimes, emphasizing that the combined effects of both waves can lead to very fast (2-10 h) dropouts. Scaling laws for the loss timescales are derived, allowing us to determine the various plasma and wave parameter domains potentially leading to strong and fast dropouts. The analysis reveals that the fastest MeV electron dropouts occur at approximately the same rate over some high energy range and almost independently of EMIC wave amplitudes above a certain threshold. These results should help to better understand the dynamic variability of the radiation belts. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84970029026&doi=10.1002%2f2016GL068921&partnerID=40&md5=c2a34911ef5366223c98fd109694d41b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9996
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: CEA, DAM, DIF, Arpajon, France
Recommended Citation:
Mourenas D.,Artemyev A.V.,Ma Q.,et al. Fast dropouts of multi-MeV electrons due to combined effects of EMIC and whistler mode waves[J]. Geophysical Research Letters,2016-01-01,43(9).