摘要
极光西向涌浪(WTS)被定义为磁层亚暴开始的重要标志,它是伴随带电粒子沉降过程在极光带电离层出现的特定的极光运动形态.本文给出了极光西向涌浪的二维动力学模式,亚暴开始,伴随粒子沉降在电离层产生离子密度梯度(电导率梯度),在背景电场中激发出低频漂移波,它的传播给出极光西向涌浪运动的主要特性.
The westward traveling surge (WTS) of aurora is defined as an important signature of the substorm onset. It is a special motion form of aurora which appears in the wake of the precipitation of the electric particles. There have been many works about calculating of electric field, conductivity and field-line current distribution in polar region during WTS. This paper puts forward a dynamic model of WTS in two-dimension plane. With the beginning of the sbsorm and following the precipitation of the electrons into inosphere, the gradient of ion density occurs (gradient of sonductivity). At the same time low frequency drift wave is excited in background electric field and its propagation reflects the main feature of WTS motion.
出处
《空间科学学报》
CAS
CSCD
北大核心
1989年第1期13-19,共7页
Chinese Journal of Space Science
基金
中国科学院科学基金
