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利用Cluster在2001～2005年期间每年6～11月4s精度的磁场数据对磁尾电流片的磁场分布特性进行了统计分析.结果表明,电流片中心处磁场及其Bz分量的强度在磁尾午夜区通常较弱,而在磁层晨、昏两侧处普遍较强,这表明午夜区的电流片较薄,而在晨、昏两侧的电流片较厚.在晨昏两侧处,电流片拍动剧烈,尤以晨侧最甚,而午夜区的电流片拍动最弱.在磁地方时21:00～01:00范围内,负Bz及扁平电流片出现的几率较大,磁重联或电流中断等活动比较容易发生.磁尾电流片中By分量和磁力线倾斜角的频次分布都近似满足正态分布,扁平电流片的出现几率约是标准电流片的1/3;而磁场强度Bmin和Bz分量则主要分布在1～10nT范围内.电流片中By分量的强度近似为1AU处行星际磁场By分量的两倍,二者的相关系数以扁平电流片尤其高,这表明电流片中By的大小和符号易受行星际By等外部因素的影响.
The magnetic field distribution characteristics of the magnetic tail current sheet were statistically analyzed by using the magnetic field data of the 4s accuracy of Cluster from 2001 to 2005. The results show that the intensity of the magnetic field and its Bz component at the center of the current sheet is at midnight The area is generally weaker, and generally thicker in the morning and evening of the magnetic layer, indicating that the current sheet at midnight is thinner and thicker at the morning and late sides, Flapping violently, especially in the morning side of the worst, while the midnight area of the current film flapping the weakest in the magnetic place when 21: 00 ~ 01: 00, negative Bz and flat current film appear more likely, the magnetic weight Joint or current interruption and other activities are more prone to occur.Motor tail current in the By component and the magnetic line inclination angle frequency distribution to meet the normal distribution of the flat sheet of the current probability of about 1/3 of the standard current sheet; and magnetic field strength The Bmin and Bz components are mainly distributed in the range of 1 ~ 10nT.The intensity of the By component in the current slice is approximately twice that of the By field in the interplanetary magnetic field at 1AU, and the correlation coefficient of the two is especially high for the flat current slice, The size and symbols of By are susceptible to external factors such as interplanetary By .