DOI: 10.1029/2018JA025390
Scopus记录号: 2-s2.0-85050307459
论文题名: Properties of Intense Field-Aligned Lower-Band Chorus Waves: Implications for Nonlinear Wave-Particle Interactions
作者: Zhang X.-J. ; Thorne R. ; Artemyev A. ; Mourenas D. ; Angelopoulos V. ; Bortnik J. ; Kletzing C.A. ; Kurth W.S. ; Hospodarsky G.B.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 7 起始页码: 5379
结束页码: 5393
语种: 英语
英文关键词: chorus waves
; effective amplitude
; nonlinear wave-particle interaction
; spatial distribution
; statistics
; wave packet length
英文摘要: Resonant interactions between electrons and chorus waves are responsible for a wide range of phenomena in near-Earth space (e.g., diffuse aurora and acceleration of > 1 MeV electrons). Although quasi-linear diffusion is believed to be the primary paradigm for describing such interactions, an increasing number of investigations suggest that nonlinear effects are also important in controlling the rapid dynamics of electrons. However, present models of nonlinear wave-particle interactions, which have been successfully used to describe individual short-term events, are not directly applicable for a statistical evaluation of nonlinear effects and the long-term dynamics of the outer radiation belt, because they lack information on the properties of intense (nonlinearly resonating with electrons) chorus waves. In this paper, we use the Time History of Events and Macroscale Interactions during Substorms and Van Allen Probes data sets of field-aligned chorus waveforms to study two key characteristics of these waves: effective amplitude Bw (nonlinear interaction can occur when Bw > 2) and wave packet length β (the number of wave periods within it). While as many as 10–15% of chorus wave packets are sufficiently intense ( Bw > 2 –3) to interact nonlinearly with relativistic electrons, most of them are short (β < 10) reducing the efficacy of such interactions. Revised models of nonlinear interactions are thus needed to account for the long-term effects of these common, intense but short chorus wave packets. We also discuss the dependence of Bw, β on location (MLT and L-shell) and on the properties of the suprathermal electron population. ©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/113558
Appears in Collections: 气候减缓与适应
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作者单位: 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, Russian Federation; CEA, DAM, DIF, Arpajon, France; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States
Recommended Citation:
Zhang X.-J.,Thorne R.,Artemyev A.,et al. Properties of Intense Field-Aligned Lower-Band Chorus Waves: Implications for Nonlinear Wave-Particle Interactions[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(7)