A unified model of auroral arc growth and electron acceleration in the magnetosphere-ionosphere coupling

被引：13
作者：
Watanabe, T. -H. [1 ]
机构：
[1] Nagoya Univ, Dept Phys, Nagoya, Aichi 464, Japan
来源：
GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 17期
关键词：
magnetosphere-ionosphere coupling; auroral growth; kinetic Alfven wave; Alfvenic aurora; feedback instability; gyrokinetics; ALFVEN WAVES; KINETIC-THEORY; SIMULATION; RESONATOR; EQUATIONS; PLASMA; FIELDS;
D O I：
10.1002/2014GL061166
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
A unified physical model of auroral arc growth and electron acceleration is constructed from the gyrokinetic and two-fluid equations for the magnetosphere-ionosphere (M-I) coupling system. The present theory describes destabilization of kinetic Alfven waves (KAWs) in the M-I coupling, where development of upward and downward field-aligned currents carried by the KAWs leads to ionospheric density enhancement and depletion, respectively. The feedback M-I coupling through KAWs elucidates growth of auroral arcs and field-aligned acceleration of electrons self-consistently and provides a possible explanation to the Alfvenic auroras observed by the FAST spacecraft.
引用
收藏
页码：6071 / 6077
页数：7
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