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地球磁尾电流片拍动的起源和运动方式一直是磁尾动力学研究中的重要问题之一.本文利用Cluster卫星数据,统计分析了2001年和2003年的磁尾电流片运动特性,利用我们最近发展的分析结构特征方向和运动速度的新方法,计算了磁尾电流片的运动速度,并给出了磁尾电流片在GSE坐标系中XY平面内的速度分布图.我们发现磁尾电流片存在着两种不同性质的运动,除了磁尾电流片向晨昏方向的运动,分析表明,磁尾电流片还存在着明显朝向子夜方向的运动(即GSE坐标系中Y=0平面).观测还进一步表明,位于磁尾中间区域(|Y_GSE|<8Re)的电流片的扰动,其南北向的速度分量相对较大,这从另一个方面说明磁尾中性片的中间区域可能是导致大部分磁尾电流片拍动事件中电流片朝向晨昏两侧运动的源区.对于运动方向朝向子夜方向(Y=0平面)的电流片,其运动方式与运动方向朝向晨昏两侧的电流片存在着明显的不同,因此我们推测,它们应具有不同的起源.本文的统计结果,为我们深入研究地球磁尾电流片拍动源区等物理问题提供了的参考依据.
The origin and the movement mode of the magnetocurrent beam flapping has always been one of the most important problems in the research of magnetotail dynamics.In this paper, we use the Cluster satellite data to statistically analyze the motion characteristics of the magnetotail sheet in 2001 and 2003, Recently, a new method of analyzing the direction and velocity of structural features has been used to calculate the velocity of the magnetotail sheet, and the velocity profile of the magnetotail sheet in the XY plane in the GSE coordinate system has been given. There are two kinds of motions with different motions, except for the movement of the tail-end current slice to the twilight direction, and the analysis shows that the magnet tail-end current motion obviously exists in the midnight direction (that is, the Y = 0 plane in the GSE coordinate system). It is further shown that the perturbation of the current patch in the middle region of the magnetotail (| Y_GSE | <8Re) has a relatively large north-south velocity component, which on the other hand indicates that the middle region of the magnet tail neutral patch may be a large Part of the magnetic tail current piece flapping event current sheet moving toward the morning and evening both sides of the source area for the direction of motion toward the sub-night direction (Y = 0 plane) of the current piece, its movement and direction of movement towards the dusk on both sides of the electricity Therefore, we speculate that they should have different origins.The statistical results of this paper provide a reference for our further study on the physical problems such as the moving source region of the Earth’s tail current flaps.