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Quiescent Discrete Auroral Arcs: A Review of Magnetospheric Generator Mechanisms
Space Science Reviews ( IF 10.3 ) Pub Date : 2019-12-16 , DOI: 10.1007/s11214-019-0619-5
Joseph E. Borovsky , Joachim Birn , Marius M. Echim , Shigeru Fujita , Robert L. Lysak , David J. Knudsen , Octav Marghitu , Antonius Otto , Tomo-Hiko Watanabe , Takashi Tanaka

One of the longstanding questions of space science is: How does the Earth’s magnetosphere generate auroral arcs? A related question is: What form of energy is extracted from the magnetosphere to drive auroral arcs? Not knowing the answers to these questions hinders our ability to determine the impact of auroral arcs on the magnetospheric system. Magnetospheric mechanisms for driving quiescent auroral arcs are reviewed. Two types of quiescent arcs are (1) low-latitude non-Alfvenic (growth-phase) arcs magnetically connecting to the electron plasma sheet and (2) high-latitude arcs magnetically connecting near the plasma-sheet boundary layer. The reviews of the magnetospheric generator mechanisms are separated for the two types of quiescent arcs. The driving of auroral-arc currents in large-scale computer simulations is examined. Predicted observables in the magnetosphere and in the ionosphere are compiled for the various generator mechanisms.

中文翻译:

静止离散极光弧:磁层发生器机制综述

空间科学长期存在的问题之一是:地球的磁层是如何产生极光弧的?一个相关的问题是:从磁层中提取什么形式的能量来驱动极光弧?不知道这些问题的答案会阻碍我们确定极光弧对磁层系统的影响的能力。综述了驱动静止极光弧的磁层机制。两种类型的静止弧是 (1) 低纬度非阿尔芬 (生长相) 弧与电子等离子体片磁连接和 (2) 高纬度弧在等离子体片边界层附近磁连接。对于两种类型的静止弧,磁层发生器机制的评论是分开的。研究了在大规模计算机模拟中极光弧电流的驱动。
更新日期:2019-12-16
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