Observation of a Sharp Negative Dipolarization Front in the Reconnection Outflow Region

Observation of a Sharp Negative Dipolarization Front in the Reconnection Outflow Region
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重联流出区尖锐负偶极锋的观察

DOI:
10.1088/0256-307x/28/10/109402
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发表时间:
2011-09
影响因子:
3.5
通讯作者:
Pang Ye
Pang Ye
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhou Meng;Huang Shi-Yong;Deng Xiao-Hua;Pang Ye

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最近在地球磁尾探测到一个尖锐的偶极锋(DF),它与复杂的动力学效应有关。我们提出了一个事件中,尾部传播负DF(与Bz急剧下降到负值)附近的重联区域观察。负DF的厚度与局部离子回旋半径/惯性长度相当。在前端有一个很强的场向电流。电磁哨声波增强观察周围的前,与逆流电子束。我们进一步比较观察到的负DF与最近的动力学模拟结果,以及向地球传播的DF THEMIS航天器所观察到的功能。
A sharp dipolarization front (DF) has recently been detected in the Earth's magnetotail and is associated with complex kinetic effects. We present one event where a tailward propagating negative DF (with Bz decreasing sharply to negative value) was observed near a reconnection region. The thickness of the negative DF is comparable with the local ion gyro-radius/inertial length. There is a strong field-aligned current at the front. Electromagnetic whistler wave enhancements are observed around the front, associated with counter-streaming electron beams. We further compare the features of the observed negative DF with the recent kinetic simulation results, as well as the Earthward propagating DFs observed by the THEMIS spacecraft.
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