Magnetosphere-ionosphere coupling during substorm onset
Magnetosphere-ionosphere coupling during substorm onset
复制标题
亚暴爆发期间磁层-电离层耦合
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
A. Yahnin
中科院分区：
文献类型：
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作者：
N. Maynard;W. J. Burke;G. Erickson;E. M. Basinka;A. Yahnin
通过对CRRES卫星测量和地面测量相结合的分析，为亚暴的发生发展了一种经验性的设想。该过程的发展，从波纹的等离子体片的内边缘与黄昏到黎明的电场偏移，开始之前的偶极。坡印亭通量的重要性被认为是。当大量的能量在两个方向流动，第二个周期比第一个周期更强时，亚暴就会形成。当两个方向上的能量流动很弱或相位不同时，就会发生赝破裂。观测结果表明，黄昏到黎明的交叉尾电场的偏移与CRRES观测到的电流和粒子能量的变化以及地面上观测到的超低频波活动相关。与亚暴电流楔相关的磁场排列电流丝的磁特征被观察到由该过程发起。
Through the analysis of a combination of CRRES satellite measurements and ground-based measurements, an empirical scenario was developed for the onset of substorms. The process develops from ripples at the inner edge of the plasma sheet associated with dusk to dawn excursions of the electric field, prior to the beginning of dipolarization. The importance of Poynting flux is considered. Substorms develop when significant amounts of energy flow in both directions with the second cycle stronger than the initial cycle. Pseudobreakups occur when the energy flowing in both directions is weak or out of phase. The observations indicate that the dusk to dawn excursions of the cross-tail electric field correlate with changes in currents and particle energies observed by CRRES, and with ultra low frequency wave activity observed on the ground. Magnetic signatures of field aligned current filaments, associated with the substorm current wedge were observed to be initiated by the process.