电离层等效电流体系对行星际激波的响应研究

	电离层等效电流体系对行星际激波的响应研究
	张青梅 ; 孙天然 ; 张佼佼 ; 李传起 ; 王赤
刊名	空间科学学报
	2013
卷号	33 期号:5 页码:486-493
关键词	磁流体力学模拟行星际激波电离层等效电流
ISSN号	0254-6124
其他题名	Response of the Ionospheric Equivalent Current Systems to Interplanetary Shocks
通讯作者	北京8701信箱
中文摘要	行星际激波是导致地球磁层-电离层系统发生扰动的重要原因之一,其可以通过对磁层-电离层系统电流体系的改变来影响地磁变化.本文采用全球三维磁流体力学数值模拟方法,分析了行星际激波作用下电离层等效电流体系的即时响应.模拟结果表明,在激波作用下伴随着异常场向电流对的产生,电离层在午前午后出现一对反向的等效电流涡.这对涡旋一边向极侧和夜侧运动,一边经历强度增强和减弱直至消失的过程.激波过后等效电流体系图像逐渐演化为激波下游行星际条件控制的典型图像.这个响应过程与行星际激波强度有关,激波强度越强,则反向的等效电流涡旋强度越大,寿命也就越短.
英文摘要	Interplanetary (IP) shocks, one of the important causes of the magnetosphere ionosphere disturbances, could affect the geo-magnetic field by changing the current systems in the magnetosphere——ionosphere region. By using a global three dimensional MHD simulation code, we analyze the immediate responses of the Equivalent Current Systems (ECS) in the Earth's ionosphere to the impact of IP shocks. The model results show that after the shock arrival a pair of abnormal Field-Aligned Current (FAC) appears, flowing into and out of the ionosphere on the dusk and dawn side respectively. Also developed in the ionosphere is the two-cell ECS: an anticlockwise circulation in the dawn hemisphere and a clockwise one in the dusk hemisphere. The two ECS vortices shift poleward and tailward after their formation. In the meantime, their intensities increase at first and then decrease to virtually disappear within tens of seconds. At last the ECS pattern reaches a quasi-steady state which is controlled by the interplanetary conditions downstream of the IP shock. The quantitative characteristics of such response processes depend on the intensity of the IP shock: for a stronger shock, the two-cell ECS becomes more intense, and its lifetime is shorter.
学科主题	空间物理
资助信息	国家重点基础研究发展计划项目(2012CB825602);国家自然科学基金项目(41231067)和国家重点实验室专项基金项目
语种	中文
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/1475]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	张青梅,孙天然,张佼佼,等. 电离层等效电流体系对行星际激波的响应研究[J]. 空间科学学报,2013,33(5):486-493.
APA	张青梅,孙天然,张佼佼,李传起,&王赤.(2013).电离层等效电流体系对行星际激波的响应研究.空间科学学报,33(5),486-493.
MLA	张青梅,et al."电离层等效电流体系对行星际激波的响应研究".空间科学学报 33.5(2013):486-493.