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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Cluster observations of bidirectional beams caused by electron trapping during antiparallel reconnection
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Cluster observations of bidirectional beams caused by electron trapping during antiparallel reconnection

机译：集群的观察双向光束引起通过电子捕获在反平行的重新连接

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摘要

So-called bidirectional electron beams have been observed by a number of spacecraftmissions mainly in the inflow of reconnection regions. Here we show that these beam-likefeatures in the electron distribution function are explained by electron trapping. Thetrapping is mainly controlled by a positive acceleration potential, Ф||, which is related tothe structure of the parallel electric fields in the vicinity of the reconnection region. Guidedby the results of a kinetic simulation, we extend a recent analytical model for the electrondistribution function applicable to the inflow region in antiparallel reconnection. Themodel is successfully compared to data observed by the four Cluster spacecraft inside anactive reconnection region. The anisotropy recorded in the electron distributions isconsistent with mainly electric trapping of electrons by Ф||. In the analysis we determinethe profiles of Ф||along the paths of the Cluster spacecraft during their encounter with areconnection region. Typical values of eФ|| are in excess of 1 keV (much higher than theelectron temperature in the ambient lobe plasma) and Ф||traps all thermal electrons. This isimportant for the internal structure of the Hall current system associated with the iondiffusion region because extended trapping significantly alters the electrical and kinematicproperties of the electron fluid. Finally, at the boundary between the inflow and exhaustregions the values of eФ|| in the inflow region smoothly approach the shoulder energies (up to15 keV) of the so-called flat-top distribution observed in the reconnection exhaust. Thissuggests that Ф||may be important also to the formation of the flat-top distributions.
机译：所谓双向电子束观察到许多spacecraftmissions主要在重新连接的流入地区。表明这些beam-likefeatures电子分布函数是用电子来解释捕获。积极的加速度潜力,Ф| |,相关结构的并行电场附近的重新连接地区。仿真中,我们扩展最近的分析模型electrondistribution函数适用在反平行的流入地区重新连接。观察到的数据四个集群航天器在积极的地区重新连接。各向异性记录在电子分布isconsistent主要电动捕获电子的Ф| |。概要文件的Ф| |集群的路径飞船在他们遇到areconnection地区。超过1 keV(远高于theelectron在等离子体环境叶)和温度Ф| |热电子陷阱。目前大厅的内部结构系统与iondiffusion地区有关因为扩展捕获显著改变的电气和kinematicproperties电子流体。流入和exhaustregions e的值Ф| |顺利流入地区的方法肩膀(to15 keV)所谓的能量平顶建筑物分布中观察到重新连接排气。重要的平顶建筑物的形成分布。

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