Remote sensing of a near-Earth neutral line during the 5 October 2000 substorm
Remote sensing of a near-Earth neutral line during the 5 October 2000 substorm
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DOI：
10.5194/angeo-24-3497-2006
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发表时间：
2006-12
影响因子：
1.9
通讯作者：
D. Nagata;S. Machida;S. Ohtani;S. Mende;Y. Saito;T. Mukai
中科院分区：
文献类型：
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作者：
D. Nagata;S. Machida;S. Ohtani;S. Mende;Y. Saito;T. Mukai
本文研究了2000年10月5日亚暴恢复阶段近地中性线的连续运动。估算是基于Onsager（1991）提出的PSBL离子束模型和Geotail观测。估计与地球的距离为20至60公里E，并以250至300公里/秒的速度向后撤退。这一事件开始与太阳风间断的到来。电磁场和电子的同时观测表明存在与场向电流相关的向地传播波。基于这些观测，我们认为PSBL离子束的源是磁层压缩形成的后退的近地中性线。还提出了两个方案的近地中性线运动的尾部动力学。一个是形成多个中性线，以产生长等离子体团。另一种是在近地区域和中尾停滞等离子体团之间的一条中性线的振荡。
In this paper we examined the continuous motions of a near-Earth neutral line during the recovery phase of the 5 October 2000 substorm. Estimation was based on the PSBL ion beam model proposed by Onsager (1991) and the Geotail observations. Estimated distances from the Earth ranged from 20 to 60 R E and retreated tailward at velocities of 250 and 300 km/s. This event initiated with the arrival of solar wind discontinuity. Simultaneous observations of electromagnetic field and electrons indicate the existence of earthward propagating waves associated with field-aligned currents. Based on these observations, we suggest that the source of the PSBL ion beams was the retreating near-Earth neutral line formed by the compression of the magnetosphere. Two scenarios of near-Earth neutral line motion in the tail dynamics are also proposed. One is the formation of plural neutral lines to create a long plasmoid. The other is the oscillation of one neutral line between the near-Earth region and the mid-tail stagnant plasmoid.