Electron distribution functions in the diffusion region of asymmetric magnetic reconnection

被引：70
|
作者：
Bessho, N. [1 ,2 ]
Chen, L. -J. [1 ,2 ]
Hesse, M. [2 ]
机构：
[1] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[2] NASA, Goddard Space Flight Ctr, Heliophys Sci Div, Greenbelt, MD USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 05期
基金：
美国国家科学基金会;
关键词：
magnetic reconnection; asymmetric reconnection; electron distribution function; PIC simulation; stagnation point; diffusion region; ACCELERATION;
D O I：
10.1002/2016GL067886
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We study electron distribution functions in a diffusion region of antiparallel asymmetric reconnection by means of particle-in-cell simulations and analytical theory. At the electron stagnation point, the electron distribution comprises a crescent-shaped population and a core component. The crescent-shaped distribution is due to electrons coming from the magnetosheath toward the stagnation point and accelerated mainly by electric field normal to the current sheet. Only a part of magnetosheath electrons can reach the stagnation point and form the crescent-shaped distribution that has a boundary of a parabolic curve. The penetration length of magnetosheath electrons into the magnetosphere is derived. We expect that satellite observations can detect crescent-shaped electron distributions during magnetopause reconnection.
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页码：1828 / 1836
页数：9
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