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.

引用

页数：8

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