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用一元磁流体力学广义行波展开法进一步研究了近磁尾内边界的位型不稳定性。将笔者以前关于近磁尾赤道面附近的漂移气球模不稳定性工作推广到非赤道区和存在非定常地向流的情形。论证了减切地向流将导致近磁尾内边界绝对不稳定，并使增长率显著增加。研究表明在亚暴电流楔的形成过程中，中磁尾磁重联和近磁尾位型不稳定性可能协同地起着重要作用。在此基础上提出了一个磁层亚暴膨胀相的中性线一电流中断协同模型。该模型能解释卫星和地面的许多亚暴观测结果。不同的亚暴可能有不同的触发过程。
The uniaxial magnetohydrodynamics generalized traveling wave expansion method was used to further investigate the position instability of the near-magnet-tail boundary. In the past, the author generalized the work on the instability of the floating-balloon model near the near-equatorial plane to the non-equatorial zone and unsteady flow. It is demonstrated that the cut-to-flow will result in the absolute instability of the innermost magnetic tail and the significant increase of the growth rate. The results show that during the formation of sub-current electric wedges, the magnetic tail magnetic reconnection and near-magnetic tail-type instability may play an important role in coordination. On the basis of this, a neutral-current interrupting synergistic model of subdued phase in magnetosphere is proposed. The model can explain many sub-storms observations on satellites and on the ground. Different sub-storm may have different triggering process.