Electron energization and structure of the diffusion region during asymmetric reconnection

被引：65
|
作者：
Chen, Li-Jen [1 ,2 ]
Hesse, Michael [1 ]
Wang, Shan [1 ,2 ]
Bessho, Naoki [1 ,2 ]
Daughton, William [3 ]
机构：
[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
[2] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[3] Los Alamos Natl Lab, Los Alamos, NM USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 06期
基金：
美国国家科学基金会;
关键词：
magnetic reconnection; electron diffusion region; electron acceleration; electron heating; collisionless resistivity; collisionless dissipation; MAGNETIC RECONNECTION; X-LINE; PHYSICS;
D O I：
10.1002/2016GL068243
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Results from particle-in-cell simulations of reconnection with asymmetric upstream conditions are reported to elucidate electron energization and structure of the electron diffusion region (EDR). Acceleration of unmagnetized electrons results in discrete structures in the distribution functions and supports the intense current and perpendicular heating in the EDR. The accelerated electrons are cyclotron turned by the reconnected magnetic field to produce the outflow jets, and as such, the acceleration by the reconnection electric field is limited, leading to resistivity without particle-particle or particle-wave collisions. A map of electron distributions is constructed, and its spatial evolution is compared with quantities previously proposed to be EDR identifiers to enable effective identifications of the EDR in terrestrial magnetopause reconnection.
引用
收藏
页码：2405 / 2412
页数：8
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