Motion of the dipolarization front during a flow burst event observed by Cluster
Motion of the dipolarization front during a flow burst event observed by Cluster
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DOI：
10.1029/2002gl015763
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发表时间：
2002-10
影响因子：
5.2
通讯作者：
R. Nakamura;Wolfgang Baumjohann;B. Klecker;Y. Bogdanova;A. Balogh;H. Rème;J. Bosqued;I. Dandouras-I.-Dandour
中科院分区：
文献类型：
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作者：
R. Nakamura;Wolfgang Baumjohann;B. Klecker;Y. Bogdanova;A. Balogh;H. Rème;J. Bosqued;I. Dandouras-I.-Dandour
本文研究了2001年7月22日在地磁活动增强期间发生的一次流爆发事件，当时星团位于午夜后的磁尾。流动爆发与主要向地流动的高速部分之前的明显双极化相关。通过对四个探测器观测数据的分析，发现一个厚度约2000 km的偶极锋以约77 km/s的速度向地球和黎明方向移动。等离子体在这个前面是偏转的，一致的等离子体前面的局部等离子体气泡中心在午夜侧被推到一边的移动障碍物。高速流的主体主要平行于偶极前沿。这些观测结果表明，跨越尾部的偶极锋的演化与快速气流直接耦合。
In this paper we study a flow burst event which took place during enhanced geomagnetic activity on July 22, 2001, when Cluster was located in the postmidnight magnetotail. The flow burst was associated with a clear dipolarization ahead of the high‐speed part of the predominantly Earthward directed flow. Based on the analysis of the four spacecraft data, we found that a ∼2000 km thick dipolarization front moves Earthward and dawnward with a speed of ∼77 km/s. The plasma before this front is deflected, consistent with the plasma ahead of a localized plasma bubble centered at midnight side being pushed aside by the moving obstacle. The main body of the high‐speed flow is directed mainly parallel to the dipolarization front. These observations indicate that the evolution of the dipolarization front across the tail is directly coupled with the fast flow.