Secondary Magnetic Reconnection at Earth’s Flank Magnetopause
Secondary Magnetic Reconnection at Earth’s Flank Magnetopause
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DOI：
10.3389/fspas.2021.740560
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
B. Tang;W. Li;C. Wang;Y. Khotyaintsev;D. Graham;Q. H. Zhang;T. Sun;H. Li;X. Y. Wang;K. Trattner;B. Giles;P. Lindqvist;R. Ergun;J. Burch
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文献类型：
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作者：
B. Tang;W. Li;C. Wang;Y. Khotyaintsev;D. Graham;Q. H. Zhang;T. Sun;H. Li;X. Y. Wang;K. Trattner;B. Giles;P. Lindqvist;R. Ergun;J. Burch
我们利用磁层多尺度观测报告了地球侧面磁层顶的局部二次磁重联。这种重联发生在磁层顶边界上，大尺度的原始磁层重联产生的闭合磁力线和开放磁力线之间存在较大的磁切变。给出了二次重联的证据，其中包括二次离子喷流和电子扩散区的相遇。因此，观察到的二次重联表明了从全球尺度到电子尺度的跨尺度过程。由于在早晨的电离层也观察到极光变亮，目前的二次重联为太阳风进入地球空间提供了一条新的途径，对经典的地下城循环提供了重要的修改。
We report local secondary magnetic reconnection at Earth’s flank magnetopause by using the Magnetospheric Multiscale observations. This reconnection is found at the magnetopause boundary with a large magnetic shear between closed magnetospheric field lines and the open field lines generated by the primary magnetopause reconnection at large scales. Evidence of this secondary reconnection are presented, which include a secondary ion jet and the encounter of the electron diffusion region. Thus the observed secondary reconnection indicates a cross-scale process from a global scale to an electron scale. As the aurora brightening is also observed at the morning ionosphere, the present secondary reconnection suggests a new pathway for the entry of the solar wind into geospace, providing an important modification to the classic Dungey cycle.