Nightside geosynchronous magnetic field response to interplanetary shocks: Model results

	Nightside geosynchronous magnetic field response to interplanetary shocks: Model results
	Sun, T. R.; Wang, C.; Li, H.; Guo, X. C.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2011
卷号	116 页码:A04216
ISSN号	0148-0227
通讯作者	Sun, TR (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100080, Peoples R China.
中文摘要	Inspired by the fact that spacecraft at geosynchronous orbit may observe an increase or decrease in the magnetic field in the midnight sector caused by interplanetary fast forward shocks (FFS), we perform global MHD simulations of the nightside magnetospheric magnetic field response to interplanetary (IP) shocks. The model reveals that when a FFS sweeps over the magnetosphere, there exist mainly two regions: a positive response region caused by the compressive effect of the shock and a negative response region which is probably associated with the temporary enhancement of earthward convection in the nightside magnetosphere. IP shocks with larger upstream dynamic pressures have a higher probability of producing a decrease in B(z) that can be observed in the midnight sector at geosynchronous orbit, and other solar wind parameters such as the interplanetary magnetic field (IMF) B(z) and IP shock speed do not seem to increase this probability. Nevertheless, the southward IMF B(z) leads to a stronger and larger negative response region, and a higher IP shock speed results in stronger negative and positive response regions. Finally, a statistical survey of nightside geosynchronous B(z) response to IP shocks between 1998 and 2005 is conducted to examine these model predictions.
英文摘要	Inspired by the fact that spacecraft at geosynchronous orbit may observe an increase or decrease in the magnetic field in the midnight sector caused by interplanetary fast forward shocks (FFS), we perform global MHD simulations of the nightside magnetospheric magnetic field response to interplanetary (IP) shocks. The model reveals that when a FFS sweeps over the magnetosphere, there exist mainly two regions: a positive response region caused by the compressive effect of the shock and a negative response region which is probably associated with the temporary enhancement of earthward convection in the nightside magnetosphere. IP shocks with larger upstream dynamic pressures have a higher probability of producing a decrease in B(z) that can be observed in the midnight sector at geosynchronous orbit, and other solar wind parameters such as the interplanetary magnetic field (IMF) B(z) and IP shock speed do not seem to increase this probability. Nevertheless, the southward IMF B(z) leads to a stronger and larger negative response region, and a higher IP shock speed results in stronger negative and positive response regions. Finally, a statistical survey of nightside geosynchronous B(z) response to IP shocks between 1998 and 2005 is conducted to examine these model predictions.
学科主题	空间物理
收录类别	SCI
资助信息	NNSFC [40921063, 40831060, 40911120062]; Specialized Research Fund for State Key Laboratories of China
语种	英语
公开日期	2014-12-15
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/3153]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Sun, T. R.,Wang, C.,Li, H.,et al. Nightside geosynchronous magnetic field response to interplanetary shocks: Model results[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A04216.
APA	Sun, T. R.,Wang, C.,Li, H.,&Guo, X. C..(2011).Nightside geosynchronous magnetic field response to interplanetary shocks: Model results.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A04216.
MLA	Sun, T. R.,et al."Nightside geosynchronous magnetic field response to interplanetary shocks: Model results".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A04216.