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

作　　者：ZHOU Meng HUANG Shi-Yong DENG Xiao-Hua PANG Ye 周猛;黄狮勇;邓晓华;庞烨(Institute of Space Science and Technology,Nanchang University,Nanchang 330031;Sate Key Laboratory of Space Weather,Chinese Academy of Sciences,Beijing 100190;School of Electronics and Information,Wuhan University,Wuhan 430072;Institute of Astronomy,Nanchang University,Nanchang 330031)

机构地区：[1]Institute of Space Science and Technology,Nanchang University,Nanchang 330031 [2]Sate Key Laboratory of Space Weather,Chinese Academy of Sciences,Beijing 100190 [3]School of Electronics and Information,Wuhan University,Wuhan 430072 [4]Institute of Astronomy,Nanchang University,Nanchang 330031

出　　处：《Chinese Physics Letters》2011年第10期288-291,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.41004060 and 40890163;the Open Research Fund Program of the Key Laboratory of Space Weather,Chinese Academy of Sciences;the Fundamental Research Funds for the Central Universities.

摘　　要：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.

关 键 词：EARTH POLARIZATION PROPAGATING 

分 类 号：P35[天文地球—空间物理学]