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arXiv 2006.14834physics.space-phastro-ph.EP
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木星不同寻常的磁层拓扑结构如何构造其极光

How Jupiter's Unusual Magnetospheric Topology Structures Its Aurora

Binzheng Zhang, Peter A. Delamere, Zhonghua Yao, Bertrand Bonfond, D. Lin, Kareem A. Sorathia, Oliver J. Brambles, William Lotko, Jeff S. Garretson, Viacheslav … 展开作者

Binzheng Zhang, Peter A. Delamere, Zhonghua Yao, Bertrand Bonfond, D. Lin, Kareem A. Sorathia, Oliver J. Brambles, William Lotko, Jeff S. Garretson, Viacheslav G. Merkin, Denis Grodent, William R. Dunn, John G. Lyon

摘要:

木星明亮持久的极地极光和地球黑暗的极地区域表明行星的磁层拓扑结构非常不同。高分辨率的全球模拟表明,行星际和木星磁场之间的界面处的重联速率太慢,无法在行星旋转的时间尺度上产生一个磁开放的、类似地球的极帽,导致只有一个小的新月形磁通量区域与行星际磁场相互连接。木星极冠的大部分被螺旋形的磁通量穿过,这些磁通量在行星内部闭合,延伸到外磁层,并在黎明侧的侧翼附近堆积起来,在那里,快速的差分等离子体旋转将磁力线拉向太阳。这种不寻常的磁场拓扑结构为木星独特的极光形态提供了新的见解。

英文摘要:

Jupiter's bright persistent polar aurora and Earth's dark polar region indicate that the planets' magnetospheric topologies are very different. High-resolution global simulations show that the reconnection rate at the interface between the interplanetary and jovian magnetic fields is too slow to generate a magnetically open, Earth-like polar cap on the timescale of planetary rotation, resulting in only a small crescent-shaped region of magnetic flux interconnected with the interplanetary magnetic field. Most of the jovian polar cap is threaded by helical magnetic flux that closes within the planetary interior, extends into the outer magnetosphere and piles-up near its dawnside flank where fast differential plasma rotation pulls the field lines sunward. This unusual magnetic topology provides new insights into Jupiter's distinctive auroral morphology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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