【摘要】 磁层亚暴是地球空间动力学的一个重要过程．本文对磁层亚暴进行了理论分析和观测比较研究．研究表明，减速地向流导致近磁尾处磁场位形绝对不稳定，并显著提高其增长率；中碰尾磁场重联、近磁尾电流中断以及电离层－磁层耦合可能协同作用，触发亚暴．该亚暴模型与许多观测现象相符．更多还原

【Abstract】 Magnetospheric substorms are important processes during geomagnetospheric space storms. Theoretical studies and obsevational analyses show that decreased earthward flows cause the magnetospheric configuration instability to be unsta- ble in absolutely the near earth magnetotail region and significantly enhance its growth rate. Midtail reconnection, near earch magnetotail current disruption and ionosphere- magnetosphere coupling can cooperatively trigger the expansion phase of substorms. This model is in agreement with a lot of observations.更多还原