Subcritical Growth of Electron Phase-space Holes in Planetary Radiation Belts

被引：6
作者：
Osmane, Adnane [1 ]
Turner, Drew L. [2 ]
Wilson, Lynn B. [3 ]
Dimmock, Andrew P. [1 ]
Pulkkinen, Tuija I. [1 ]
机构：
[1] Aalto Univ, Dept Elect & Nanoengn, FI-02150 Espoo, Finland
[2] Aerosp Corp, El Segundo, CA 90245 USA
[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
来源：
ASTROPHYSICAL JOURNAL | 2017年 / 846卷 / 01期
基金：
芬兰科学院;
关键词：
acceleration of particles; Earth; planetary systems; plasmas; turbulence; FAST SATELLITE-OBSERVATIONS; TIME-DOMAIN STRUCTURES; DOUBLE-LAYERS; PLASMA TURBULENCE; FIELD STRUCTURES; SOLITARY WAVES; DENSITY HOLES; SIMULATION; REGION; SCALE;
D O I：
10.3847/1538-4357/aa8367
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The discovery of long-lived electrostatic coherent structures with large-amplitude electric fields (1 <= E <= 500 mV/m) by the Van Allen Probes has revealed alternative routes through which planetary radiation belts' acceleration can take place. Following previous reports showing that small phase-space holes, with q phi/T-e(c) similar or equal to 10(-2)-10(-3), could result from electron interaction with large-amplitude whistlers, we demonstrate one possible mechanism through which holes can grow nonlinearly (i.e., gamma alpha root phi) and subcritically as a result of momentum exchange between hot and cold electron populations. Our results provide an explanation for the common occurrence and fast growth of large-amplitude electron phase-space holes in the Earth's radiation belts.
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页数：8
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