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在单流体MHD近似下，研究了有背景等离子体流存在时的近磁尾位形不稳定性．分析表明，等离子体地向流使两支漂移气球模DBM1和DBM2的不稳定增长更快．与卫星观测资料对比显示，诸多的观测观象与本模型的预言一致．这个结果对中磁尾磁场重联及高速等离子体流与亚暴膨胀相在近地触发之间的关系给出了新的解释．
Under the single-fluid MHD approximation, the near-magnetic tail instability in the presence of a background plasma flow is investigated. The analysis shows that the plasma flow to the two drift balloon mode DBM1 and DBM2 unstable growth faster. Comparisons with satellite observations show that many observational observations are consistent with the predictions of this model. This result gives a new explanation of the relationship between the magnetic tail magnetic field reconnection and the high-speed plasma flow and the near-field triggering of sub-explosion.