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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Electron diffusion region during magnetopause reconnection with an intermediate guide field: Magnetospheric multiscale observations
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Electron diffusion region during magnetopause reconnection with an intermediate guide field: Magnetospheric multiscale observations

机译:电子在磁层扩散区域重新连接与一个中间指南:磁性层的多尺度观测

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摘要

An electron diffusion region (EDR) in magnetic reconnection with a guide magnetic field approximately 0.2 times the reconnecting component is encountered by the four Magnetospheric Multiscale spacecraft at the Earth's magnetopause. The distinct substructures in the EDR on both sides of the reconnecting current sheet are visualized with electron distribution functions that are 2 orders of magnitude higher cadence than ever achieved to enable the following new findings: (1) Motion of the demagnetized electrons plays an important role to sustain the reconnection current and contributes to the dissipation due to the nonideal electric field, (2) the finite guide field dominates over the Hall magnetic field in an electron-scale region in the exhaust and modifies the electron flow dynamics in the EDR, (3) the reconnection current is in part carried by inflowing field-aligned electrons in the magnetosphere part of the EDR, and (4) the reconnection electric field measured by multiple spacecraft is uniform over at least eight electron skin depths and corresponds to a reconnection rate of approximately 0.1. The observations establish the first look at the structure of the EDR under a weak but not negligible guide field.
机译:在磁电子扩散区域(EDR)引导磁场重联重新连接的大约0.2倍组件是遇到的四个磁性层的多尺度飞船的地球的磁层。EDR两边的重新连接电流片与电子可视化分布函数2的订单级比以往更高的节奏来实现启用以下新发现:(1)的运动中扮演一个重要的退磁电子作用维持当前和重新连接导致了耗散由于不理想的电场,(2)有限的指导大厅磁场领域占主导地位一个排气和electron-scale地区修改电子流动动力学功能,(3)当前部分进行重新连接通过流入field-aligned电子的磁气圈的一部分功能,和(4)重新连接电场测量由多个宇宙飞船是在至少八个统一电子皮肤深度和对应于一个重联率约为0.1。观察建立第一个看下的结构功能弱,但不是微不足道的指南。

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