The Induced Magnetosphere of Mars: Asymmetrical Topology of the Magnetic Field Lines
The Induced Magnetosphere of Mars: Asymmetrical Topology of the Magnetic Field Lines
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DOI：
10.1029/2019gl084387
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发表时间：
2019-11
影响因子：
5.2
通讯作者：
E. Dubinin;R. Modolo;M. Fraenz;Martin Paetzold;J. Woch;L. Chai;Yong Wei;J. Connerney;J. Mcfadden;G. DiBraccio;J. Espley;E. Grigorenko;Lev Zelenyi
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作者：
E. Dubinin;R. Modolo;M. Fraenz;Martin Paetzold;J. Woch;L. Chai;Yong Wei;J. Connerney;J. Mcfadden;G. DiBraccio;J. Espley;E. Grigorenko;Lev Zelenyi
行星际磁场的不对称堆积导致磁力线在与运动电场相反的方向上产生额外的拉伸。这种拉伸以及相关的磁场力在横向推动电离层等离子体，为包含密集且缓慢移动等离子体的离子尾迹开辟了一条通道。我们发现，火星周围磁力线的缠绕始于指向运动电场方向的半球，并传播到相反的半球，在那里拉伸的行星际磁场的横向流分量在一个广阔区域内改变符号，同时伴随着闭合磁力线环的形成。火星附近的磁重联伴随着等离子体涡旋的产生，对离子动力学及其通过尾部的逃逸施加了严重的限制。所有这些特征的存在都通过混合模拟得到了证实。
An asymmetrical pileup of the interplanetary magnetic field leads to an additional draping of the field lines in the opposite direction to the motional electric field. Such a draping and the associated magnetic field forces push the ionosphere plasma in the transverse direction opening a passage for an ion trail which contains dense and slowly moving plasma. We found that wrapping of the field lines around Mars starts in the hemisphere pointing in the direction of the motional electric field and propagates to the opposite hemisphere where the cross‐flow component of the draped interplanetary magnetic field changes sign in a broad area accompanied by the formation of loops of closed field lines. Reconnection near Mars accompanied by the generation of plasma vortices imposes serious constraints on the ion dynamics and their escape through the tail. The existence of all these features is confirmed by hybrid simulations.