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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A statistical study of plasma sheet electrons carrying auroral upward field-aligned currents measured by Time History of Events and Macroscale Interactions during Substorms (THEMIS)
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A statistical study of plasma sheet electrons carrying auroral upward field-aligned currents measured by Time History of Events and Macroscale Interactions during Substorms (THEMIS)

机译：等离子体单电子的统计研究极光向上field-aligned电流通过时间的历史事件与宏观尺度来衡量互动,在亚暴(裁判)

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摘要

We have statistically investigated the electron density ne,M and temperature T_(e,M) in the near-Earth plasma sheet in terms of the magnetosphere-ionosphere coupling process, as measured by the electrostatic analyzer (ESA) on board the Time History of Events and Macroscale Interactions during Substorms (THEMIS-D) satellite from November 2007 to January 2010. To find out when and where an aurora can occur, either with or without electron acceleration, the thermal current j_∥~(th) and the conductivity K along the magnetic field line were also estimated from observations of the magnetospheric electrons with pitch angle information inside 12 RE. The thermal current, j_∥~(th)(∝ n_(e,M) T_(e,M)~(1/2) ), represents the upper limit of the field-aligned current that can be carried by magnetospheric electrons without a field-aligned potential difference. The conductivity, K(∝ n_(e,M) T_(e,M)~(1/2)), relates the upward field-aligned current, j_∥, to the field-aligned potential difference, V_∥, assuming adiabatic electron transport. The thermal current is estimated by two methods: (1) from the relation by using n_(e,M) and T_(e,M) and (2) from the total downward electron number flux. We find that in the dawnside inner magnetosphere, the thermal currents estimated by both methods are sufficient to carry typical region 2 upward field-aligned current. On the other hand, in the duskside outer magnetosphere, a field-aligned potential difference is necessary on the region 1 current since the estimated thermal current is smaller than the typical region 1 current. By using the relationship, j_∥ = KV_∥, where K is the conductivity estimated from Knight’s relation and j-∥ is the typical auroral current, we conclude that a field-aligned potential difference of V_∥ = 2–5 kV is necessary on the duskside region 1 upward field-aligned current.
机译：我们有统计调查了电子密度ne, M和温度T_ (e, M)的识别近地等离子板的magnetosphere-ionosphere耦合过程通过测量静电分析器(ESA)董事会的时间历史事件和宏观尺度相互作用,在亚暴(THEMIS-D)卫星从2007年11月到2010年1月。找出一个极光可以在何时何地发生,电子加速,要么有或没有热电流j_∥~ (th)和导电率K沿着磁场线也估计从观察磁性层的电子在12再保险。与螺旋角信息热电流,j_∥~ (th)(∝n_ (e,米)T_ (e, M) ~(1/2)识别),代表的上限当前,可以由field-aligned没有field-aligned磁性层的电子潜在的差异。n_ (e,米)T_ (e, M) ~(1/2)识别),与向上field-aligned field-aligned电流、j_∥,潜在的差异,V_∥,假设绝热电子传递。估计两种方法:(1)的关系通过使用n_ (e, M)和T_ (e, M)和(2)识别的总下行电子通量。dawnside内磁层,热电流通过两个方法是充分的估计进行典型区域2 field-aligned向上电流。磁气圈,field-aligned潜力不同地区1当前是必要的自估计热电流小1当前比典型的区域。关系,j_∥= KV_∥,K从骑士的关系和导电率估计j -∥是典型的极光电流,我们得出这样的结论的电位差field-aligned V_∥= 2 - 5 kV duskside地区1是必要的向上field-aligned电流。

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