Large Bi-Polar Signature in a Perpendicular Electric Field of Two-Dimensional Electrostatic Solitary Waves Associated with Magnetic Reconnection: Statistics and Discussion  

作　　者：LI Shi-You ZHANG Shi-Feng DENG Xiao-Hua CAI Hong 李世友;张士峰;邓晓华;蔡洪(College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073;Department of Space Physics,Wuhan University,Wuhan 430072;Nanchang University,Nanchang 330031)

机构地区：[1]College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073 [2]Department of Space Physics,Wuhan University,Wuhan 430072 [3]Nanchang University,Nanchang 330031

出　　处：《Chinese Physics Letters》2013年第1期231-234,共4页中国物理快报（英文版）

基　　金：Supported by the Post-Doctoral Research Program of China(42956);the National Basic Research Program of China;the National Natural Science Foundation of China under Grant No 40890163.

摘　　要：More than 300 electrostatic solitary waves(ESWs)with a large perpendicular component which is a bi-polar waveform structure are observed in the boundary layer within the magnetic reconnection diffusion region in the near-Earth magnetotail.Such ESWs are called two-dimensional ESWs.A Singe-reconnection-based-statistical study of two-dimensional ESWs shows that:(1)ESWs can be continuously observed in the plasma sheet boundary layer(PSBL)associated with the magnetic reconnection diffusion region,and their amplitude ranges are mainly from several tens to hundreds ofμV/m;(2)both one-dimension-like ESWs(very small magnitude on E⊥)and two-dimension-like ESWs(large magnitude on E⊥,which are even comparable to that in the E||)are observed within a small time interval;(3)within the observation time spans,more than 61%of ESWs are regarded as two-dimensional ESWs for the I_(2)D>20%.We discuss the bi-polar structure in E⊥.The observation of ESWs with a large bi-polar structure in the perpendicular electric field gives evidence that the unique waveform differs from previous understanding from observations and simulations which suggests that it should be a uni-polar waveform structure in the E⊥of ESWs.

关 键 词：structure dimension POLAR 

分 类 号：TG1[金属学及工艺—金属学]