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The analytic properties of the flapping current sheets in the earth magnetotail

机译：地磁尾巴中扑动电流片的解析特性

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摘要

The current sheet in Earth's magnetotail often flaps, and the flapping waves could be induced propagating towards the dawn and dusk flanks, which could make the current sheet dynamic. To explore the dynamic characteristics of current sheet associated with the flapping motion holistically and provide reasonable physical interpretations, detailed direct calculation and analysis have been applied to one approximate analytic model of magnetic field in the flapping current sheet. The main results from the model demonstrate: (1) the magnetic fluctuation amplitude is attenuated from the center of current sheet to the lobe regions; The larger wave amplitude would induce the larger magnetic amplitude; (2) the curvature of magnetic field lines (MFLs), with maximum at the center of current sheet, is only dependent on the displacement Z along the south-north direction from the center of current sheet, regardless of the tilt of current sheet; (3) the half-thickness of neutral sheet, h, the minimum curvature radius of MFLs, R_(cmin), and the tilt angle of current sheet, <5, satisfies h=R_(cmin) cos δ; (4) the gradient of magnetic strength forms a double-peak profile, and the peak value would be more intense if the local current sheet is more tilted; (5) current densityj and its j_y,j_z components reach the extremum at the center of CS. J and j_z would be more intense if the local current sheet is more tilted, but it is not the case for j_y; and (6) the field-aligned component of current density mainly appears in the neutral sheet, and the sign of it would change alternatively as the flapping waves passing by. To check the validity of the model, one simulation on the virtual measurements has been made, and the results are in well consistence with actual observations of Cluster.
机译：地球磁尾巴中的当前薄片经常拍打，并且拍打波可能被感应传播到黎明和黄昏的侧面，这可能使当前薄片变得动态。为了全面地研究与扑动相关的电流表的动力学特性并提供合理的物理解释，详细的直接计算和分析已应用于扑电流板中磁场的一种近似解析模型。该模型的主要结果表明：（1）磁波动幅度从电流板中心到波瓣区域衰减；较大的波幅将引起较大的磁幅； （2）磁场线（MFLs）的曲率在当前页面的中心处最大，而仅取决于从当前页面的中心沿南北方向的位移Z，而与当前页面的倾斜无关。 （3）中性板的半厚度h，MFL的最小曲率半径R_（cmin）和当前板的倾斜角<5，满足h = R_（cmin）cosδ； （4）磁场强度的梯度形成双峰分布，如果局部电流片倾斜更大，则峰值将更强； （5）电流密度j及其j_y，j_z分量到达CS中心的极值。如果局部电流表倾斜更大，则J和j_z会更强，但j_y并非如此。 （6）电流密度的场对准分量主要出现在中性片中，并且随着拍动波的通过，其符号会交替变化。为了检查模型的有效性，对虚拟测量进行了一次仿真，结果与Cluster的实际观察结果非常吻合。

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  • 来源
    《Planetary and space science》 |2010年第10期|P.1215-1229|共15页
  • 作者

    Z.J. Rong; C. Shen; A.A. Petrukovich; W.X. Wan; Z.X. Liu;

  • 作者单位

    Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;

    State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;

    Space Research Institute, 84/32 Profsoyuznaya St., Moscow 177997, Russia;

    Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;

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  • 正文语种 eng
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  • 关键词

    magnetotail; magnetic geometrical structure; flapping current sheet; tilted current sheet; neutral sheet;

    机译：磁尾磁性几何结构拍动当前工作表;倾斜的当前工作表;中性表;

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