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Alternative TitleResponse of Earth s ionosphere to interplanetary shocks
郭孝城; 胡友秋; 北京8701信箱
Source Publication地球物理学报
Keyword地球磁层 电离层 行星际激波 场向电流 数值模拟
Other AbstractThis paper presents three-dimensional,golbal numerical simulations of the dynamic response of the Earth’s ionosphere to interplanetary shocks. The background interplanetary magnetic field is spiral with a vanishing south-north component,the initial ionosphere is dominated by the region I field aligned current (FAC) and the corresponding dawn-dusk electric field,and the interplanetary shock collides with the Earth along the Sun-Earth line.It is shown that under the action of the shock,the region I current moves towards the midnight,accompanied by a successive occurrence of two FAC structures:an anomalous FAC pair of opposite direction to the region I current and a new region I current of the same direction. The anomalous FAC pair creates a transient dusl-dawn electric field over the polar cap,tailing behind the oniginal region I current and drifting towards the night side until it falls into oblivion. In the meantime,the new region I current keeps increasing and expanding towards the night and equator side,and it eventually replaces the oniginal region I current,so the polar cap returns to a state as on乡nal with a dawn-dusk electric field. Such a response depends on the strength of the interplanetary shock:for a stronger shock,the new region I current gets stronger,extends for a longer observations distance towards the equator,and reaches a lower latitude. These results tend to agree with the associated with traveling convection }rtices and midday sub-auroral patches.
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
郭孝城,胡友秋,北京8701信箱. 地球极区电离层对行星际激波的响应[J]. 地球物理学报,2007,50(4):951-956.
APA 郭孝城,胡友秋,&北京8701信箱.(2007).地球极区电离层对行星际激波的响应.地球物理学报,50(4),951-956.
MLA 郭孝城,et al."地球极区电离层对行星际激波的响应".地球物理学报 50.4(2007):951-956.
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