Effects of Magnetic Shear and Flow Shear on Magnetopause Magnetic Reconnection: Simultaneous Observations From MMS and THEMIS

IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Chongle Zhang, Binbin Tang, Wenya Li, Longlong Sang, Huijie Liu, Tongkuai Li, Jiuqi Ma, Wenlong Guo, San Lu, Quanming Lu, Chi Wang
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Abstract

Magnetic shear and flow shear form across Earth's magnetopause when shocked solar winds flow around Earth. Previous studies have shown that these two kinds of shears can similarly affect magnetopause reconnection. However, a direct investigation to evaluate their relative importance is lacking. In this study, we focus on simultaneous magnetopause reconnection observed by Magnetospheric Multiscale mission and Time History of Events and Macroscale Interactions during Substorms spacecraft at different magnetopause locations to quantitatively evaluate the magnetic shear and flow shear effects. The overall effect of magnetic shear (the normalized guide field < 1) is limited unless the guide field is sufficient strong to suppress reconnection, whereas the flow shear can significantly affect the observed reconnection outflow speed primarily by introducing non-zero X-line motion. Finally, we propose a novel relationship combining magnetic and flow shear effects by assuming independent X-line drift motion from these two effects, which shows that the X-line drift speed is dominated by the magnetosheath flow, and the suppression of reconnection is more likely to occur under strong guide field conditions. This study deepens our understanding on magnetopause reconnection occurrence and reconnection behaviors in large scales.

磁切变和流切变对磁层顶磁重联的影响:MMS和THEMIS的同步观测
当受冲击的太阳风在地球周围流动时,在地球磁层顶形成磁切变和流切变。先前的研究表明,这两种剪切对磁层顶重联的影响相似。然而,缺乏对其相对重要性的直接调查。本研究主要利用磁层多尺度任务观测到的磁层顶同时重联和亚暴航天器在不同磁层顶位置的事件时间历史和宏观尺度相互作用来定量评价磁切变和流切变效应。磁剪切的整体效果(归一化导向场<;1)是有限的,除非引导场足够强来抑制重连,而流动剪切主要通过引入非零x线运动来显著影响观察到的重连流出速度。最后,我们提出了一种结合磁剪切效应和流剪切效应的新关系,通过假设这两种效应独立的x线漂移运动,表明x线漂移速度由磁鞘流主导,并且在强引导场条件下更容易发生重联抑制。该研究加深了我们对大尺度磁层顶重联发生和重联行为的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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