DOI: 10.1029/2018JA025417
Scopus记录号: 2-s2.0-85050272442
论文题名: Electron Nonlinear Resonant Interaction With Short and Intense Parallel Chorus Wave Packets
作者: Mourenas D. ; Zhang X.-J. ; Artemyev A.V. ; Angelopoulos V. ; Thorne R.M. ; Bortnik J. ; Neishtadt A.I. ; Vasiliev A.A.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 6 起始页码: 4979
结束页码: 4999
语种: 英语
英文关键词: chorus waves
; kinetic equation
; nonlinear interaction
; radiation belts
; short wave packets
; trapping
英文摘要: One of the major drivers of radiation belt dynamics, electron resonant interaction with whistler-mode chorus waves, is traditionally described using the quasi-linear diffusion approximation. Such a description satisfactorily explains many observed phenomena, but its applicability can be justified only for sufficiently low intensity, long duration waves. Recent spacecraft observations of a large number of very intense lower-band chorus waves (with magnetic field amplitudes sometimes reaching ∼1% of the background) therefore challenge this traditional description and call for an alternative approach when addressing the global, long-term effects of the nonlinear interaction of these waves with radiation belt electrons. In this paper, we first use observations from the Van Allen Probes and Time History of Events and Macroscale Interactions during Substorms spacecraft to show that the majority of intense parallel chorus waves consist of relatively short wave packets. Then, we construct a kinetic equation describing the nonlinear resonant interaction of radiation belt electrons with such short and intense wave packets. We demonstrate that this peculiar type of nonlinear interaction produces similar effects as quasi-linear diffusion, that is, a flattening of the electron velocity distribution function within a certain energy/pitch angle range. The main difference is the much faster evolution of the electron distribution when nonlinear interaction prevails. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113755
Appears in Collections: 气候减缓与适应
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作者单位: CEA, DAM, DIF, Arpajon, France; Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, United States; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Space Research Institute, Russian Academy of Sciences, Moscow, Russian Federation; Department of Mathematical Sciences, Loughborough University, Loughborough, United Kingdom
Recommended Citation:
Mourenas D.,Zhang X.-J.,Artemyev A.V.,et al. Electron Nonlinear Resonant Interaction With Short and Intense Parallel Chorus Wave Packets[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)