Electron acceleration in the dipolarization front driven by magnetic reconnection

被引：74

作者：

Huang, Can ^{[1
,2
]}

Wu, Mingyu ^{[1
]}

Lu, Quanming ^{[1
,2
]}

Wang, Rongsheng ^{[3
]}

Wang, Shui ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China

[2] Collaborat Innovat Ctr Astronaut Sci & Technol, Harbin, Peoples R China

[3] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Ionospher Environm, Beijing, Peoples R China

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2015年 / 120卷 / 03期

基金：

美国国家科学基金会;

关键词：

magnetic reconnection; dipolarization front; electron acceleration; DIFFUSION REGION; PLASMA SHEET; MAGNETOTAIL; SIMULATIONS; SUBSTORM; FLOW; CLUSTER;

D O I：

10.1002/2014JA020918

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A large-scale two-dimensional (2-D) particle-in-cell simulation is performed in this paper to investigate electron acceleration in the dipolarization front (DF) region during magnetic reconnection. It is found that the DF is mainly driven by an ion outflow which also generates a positive potential region behind the DF. The DF propagates with an almost constant speed and gets growing, while the electrons in the DF region can be highly energized in the perpendicular direction due to betatron acceleration. For the first time, we reveal that there exists a velocity threshold; only the electrons below the threshold can be trapped by the parallel electric potential in the DF region and then energized by betatron acceleration.

引用

页码：1759 / 1765

页数：7

共 38 条

[1] BURSTY BULK FLOWS IN THE INNER CENTRAL PLASMA SHEET [J].