Van Allen Probes observations of prompt MeV radiation belt electron acceleration in nonlinear interactions with VLF chorus

被引：82
|
作者：
Foster, J. C. [1 ]
Erickson, P. J. [1 ]
Omura, Y. [2 ]
Baker, D. N. [3 ]
Kletzing, C. A. [4 ]
Claudepierre, S. G. [5 ]
机构：
[1] MIT, Haystack Observ, Westford, MA 01886 USA
[2] Kyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, Japan
[3] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
[4] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[5] Aerosp Corp, POB 92957, Los Angeles, CA 90009 USA
来源：
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2017年 / 122卷 / 01期
基金：
美国国家科学基金会;
关键词：
HIGHLY RELATIVISTIC ELECTRONS; EMISSIONS; WAVES; STORM; MAGNETOSPHERE; ENERGIZATION; DIFFUSION; FLUX;
D O I：
10.1002/2016JA023429
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Prompt recovery of MeV (millions of electron Volts) electron populations in the poststorm core of the outer terrestrial radiation belt involves local acceleration of a seed population of energetic electrons in interactions with VLF chorus waves. Electron interactions during the generation of VLF rising tones are strongly nonlinear, such that a fraction of the relativistic electrons at resonant energies are trapped by waves, leading to significant nonadiabatic energy exchange. Through detailed examination of VLF chorus and electron fluxes observed by Van Allen Probes, we investigate the efficiency of nonlinear processes for acceleration of electrons to MeV energies. We find through subpacket analysis of chorus waveforms that electrons with initial energy of hundreds of keV to 3MeV can be accelerated by 50keV-200keV in resonant interactions with a single VLF rising tone on a time scale of 10-100 ms.
引用
收藏
页码：324 / 339
页数：16
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