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低纬重联层内部等离子体结构特征

【标题】低纬重联层内部等离子体结构特征

【Title】Inner plasma structure of the low-latitude reconnection layer

【DOI】10.1029/2012JA017622

【作者】 张清和; 杨惠根; 胡红桥; 张北辰; 杨忠炜

【Author】 Zhang Qinghe ; Yang Huigen ; Hu Hongqiao ; Zhang Beichen ; Yang Zhongwei

【期刊】JOURNAL OF GEOPHYSICAL RESEARCH

【Journal】JOURNAL OF GEOPHYSICAL RESEARCH

【期刊年份】2012

【卷】117

【期】A08205

【关键词】 density depletion layer; magnetic reconnection; reconnection layer

【Keywords】 density depletion layer; magnetic reconnection; reconnection layer

【摘要】

【Abstract】We report a clear transition through a reconnection layer at the low-latitude magnetopause which shows a complete traversal across all reconnected field lines during northwestward interplanetary magnetic field (IMF) conditions. The associated plasma populations confirm details of the electron and ion mixing and the time history and acceleration through the current layer. This case has low magnetic shear with a strong guide field and the reconnection layer contains a single density depletion layer on the magnetosheath side which we suggest results from nearly field-aligned magnetosheath flows. Within the reconnection boundary layer, there are two plasma boundaries, close to the inferred separatrices on the magnetosphere and magnetosheath sides (Ssp and Ssh) and two boundaries associated with the Alfvén waves (or Rotational Discontinuities, RDsp and RDsh). The data are consistent with these being launched from the reconnection site and the plasma distributions are well ordered and suggestive of the time elapsed since reconnection of the field lines observed. In each sub-layer between the boundaries the plasma distribution is different and is centered around the current sheet, responsible for magnetosheath acceleration. We show evidence for a velocity dispersion effect in the electron anisotropy that is consistent with the time elapsed since reconnection. In addition, new evidence is presented for the occurrence of partial reflection of magnetosheath electrons at the magnetopause current layer.

【基金/项目】 国家973项目(2012CB825603) ; 极区电离层对日侧磁重联的响应研究 ; 日侧冕状极光的分类及其产生机制研究 ; 极区能量沉积过程及其对120E子午面电离层影响的研究 ; 极区海洋大气与空间环境业务化监测及其在气候变化预测中的应用(极区大气与空间环境业务化观测体系建设) ; 2012年度极地优秀论文二等奖

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