Hot electrons as tracers of large-scale structure of magnetotail current sheets ELECTRONS AS TRACERS OF CS STRUCTURE
Hot electrons as tracers of large-scale structure of magnetotail current sheets ELECTRONS AS TRACERS OF CS STRUCTURE
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热电子作为磁尾电流片大尺度结构的示踪剂 电子作为 CS 结构的示踪剂
DOI：
10.1029/2011gl047979
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发表时间：
2011
影响因子：
5.2
通讯作者：
Artemyev A
中科院分区：
文献类型：
--
作者：
Artemyev A
本文研究了地球磁尾薄电流片中电子温度的垂直分布。本文研究了星系团航天器通过62个薄电流片的电子温度对磁场te （Bx）的依赖性。profilesTe（Bx）近似为简单表达式te≈Temax(1−α(Bx/Bext)2)，其中α为常数参数，Temaxis为电子温度最大值，bextis为垂直压力平衡得到的Bx振幅。参数<α>≈1的平均值。在向地等离子体对流过程中，用绝热电子加热理论描述了等离子体的剖面。α的观测值与理论预测值的比较可以估计沿磁尾的观测电流片的尺度（Bz ~(−x/Lx)h）和电流片厚度的比值（lz）。对于大多数观测到的薄电流片slx∈[5RE， 20RE]，尺度的平均比值<Lx/Lz>≈25。
This paper is devoted to the investigation of the vertical electron temperature distribution in thin currents sheets of the Earth magnetotail. The dependence of electron temperature on magnetic fieldTe(Bx) is examined for 62 thin currents sheet crossings by the Cluster spacecraft. The profilesTe(Bx) are approximated by the simple expressionTe≈Temax(1 −α(Bx/Bext)2), whereαis a constant parameter,Temaxis the maximum value of electron temperature andBextis the amplitude ofBxobtained from the vertical pressure balance. The mean value of the parameter <α> ≈ 1. The profilesTe(Bx) are described in the frame of the theory of adiabatic electron heating in the course of the Earthward plasma convection. The comparison between the observed values ofαand the theoretical predictions allows to estimate the scaleLxof observed current sheets along the magnetotail (Bz∼ (−x/Lx)h) and the ratio ofLxand current sheet thicknessLz. For the majority of the observed thin current sheetsLx∈ [5RE, 20RE] and the average ratio of the scales <Lx/Lz> ≈ 25.