极地研究

极地研究 ›› 2007, Vol. 19 ›› Issue (2): 121-130.

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2004年4月1日磁通量传输事件特性的研究——通量管内电流密度、粒子运动与管轴方向的对比分析

张清和;刘瑞源;黄际英;Dunlop MW;胡红桥;沈超;Bogdanova YV;   

  • 出版日期:2007-06-30 发布日期:2007-06-30

CHARACTERISTICS OF THE MAGNETIC FLUX TRANSFER EVENTS ON APRIL 1 OF 2004

  • Online:2007-06-30 Published:2007-06-30

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摘要：

本文利用Cluster四颗卫星上磁通门磁力计(FGM)的同时观测,采用旋度器方法(Curlometer),计算和分析了2004年4月1日12:24到12:54UT期间Cluster卫星观测的多个磁通量传输事件(FTEs)的特性。结果表明:磁通量管内电流密度较大,可达到约10-7A/m2。应用最小方向微分法(MDD),发现这些FTE事件具有准二维结构,即为圆柱形结构,其通量管轴线方向与管内电流方向及粒子运动方向基本平行。

关键词: 电流密度;磁通量管;磁层顶

Abstract:

Based on the simultaneous FGM observations of 4 Cluster satellites,this paper calculated and analyzed the current density of FTEs occurred between 12:24 and 12:54UT on April 1,2004 by using the Curlometer analyzer.It showed that intense current flows inside the flux tubes with the current density reaching as high as about 10-7A/m2.By Minimum Directional Derivative(or Difference)(MDD) analyzing,it was also found that the FTEs were of the quasi-2D structure,the direction of the current was almost parallel to the plasma flows and the axis of the flux tubes.