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2001年9月15日0430-0515 UT期间, Cluster卫星多次穿越磁尾电流片．由FGM、CIS等仪器获得了电流片磁场,粒子速度等数据变化情况,并得到了磁尾高速流的两次明显反转．本文采用GSM坐标系．利用求磁场空间梯度张量的方法获得了越尾电流,其电流密度的峰值为28 nA/m2．并对电流片在垂直方向上的摆动和在晨昏方向的波动现象进行了分析．数据显示此时电流片为薄电流片并有一个变薄的趋势,其厚度大约为0．2-0．3．Re．磁场重联时地向流与尾向流均超过了1000km/s,并测得了电流片的法线方向和运动速度, 从而得到了磁尾电流片的结构和运动情况．
During the period of September 15, 2001, at 0430-0515 UT, the Cluster satellite traversed the magnetophillic flake several times. By FGM, CIS and other instruments to obtain the current film magnetic field, particle velocity and other data changes, and got the magnetic tail high-speed flow of two significant reversal. This text uses GSM coordinate system. The tail current was obtained by using the spatial gradient tensor method of the magnetic field, and the peak current density was 28 nA / m2. The phenomenon that the current piece swings in the vertical direction and the fluctuation phenomenon in the twilight direction are analyzed. The data shows that the current sheet is a thin current sheet with a thinning tendency at a thickness of about 0.2-0.3. Re. When the magnetic field is reconnected, both the current and the tail flow exceed 1000km / s, and the normal direction and velocity of the current piece are measured. The structure and motion of the tail piece are obtained.