A statistical and event study of magnetotail dipolarization fronts
A statistical and event study of magnetotail dipolarization fronts
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DOI：
10.5194/angeo-29-1537-2011
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发表时间：
2011-09
影响因子：
1.9
通讯作者：
D. Schmid;M. Volwerk;R. Nakamura;Wolfgang Baumjohann;M. Heyn
中科院分区：
文献类型：
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作者：
D. Schmid;M. Volwerk;R. Nakamura;Wolfgang Baumjohann;M. Heyn
抽象。利用7年（2001-2007年）的星团数据对地球磁尾的偶极锋进行了研究。事件包括有和没有高速地球流。叠加历元分析的数据表明，双极化是precancelled由Bz的增加之前的减少。随着等离子体流速的增加，偶极的持续时间趋于减小。偶极前沿的厚度平均为1.8等离子体惯性长度，与等离子体速度无关。我们发现，事件分为两类：向地和向尾移动偶极。可以假定双极化锋是切向不连续的，并且锋上的电流主要具有垂直分量。
Abstract. A study of dipolarization fronts of the Earth's magnetotail has been performed using seven years (2001–2007) of Cluster data. Events both with and without high-speed earthward flows are included. A superposed epoch analysis of the data shows that the dipolarization is preceeded by a decrease of Bz before the increase. The duration of the dipolarization tends to be decreasing with increasing velocity of the plasma flows. The thickness of the dipolarization front is on average 1.8 plasma inertial lengths, independent of the plasma velocity. We find that the events fall into two categories: Earthward and tailward moving dipolarizations. The dipolarization fronts can be assumed to be tangential discontinuities and the currents on the front have mainly a perpendicular component.