中文摘要：

采用实际的磁尾位型,利用数值模拟研究地球近地磁尾磁层亚暴过程中的磁岛合并过程。选取了磁尾电流片中三个测量点。分析了电流、磁场、等离子体密度以及速度随时间的变化规律。合理地解释磁层亚暴过程中的观测现象。

英文摘要：

The process of the island coalescence in the near-earth magnetotail during the magentoshere is investigated using the numerical simulation with the realistic magnetotail geometry.The evolution of the current,magnetic field,the density of the plasma and velocity on the three points in the magnetotail current sheet with the time is analyzed.The simulation results explain the observational phenomena during the magnetoshere substorm.