Geospace magnetic field responses to interplanetary shocks

	Geospace magnetic field responses to interplanetary shocks
	Wang, C. ; Liu, J. B. ; Li, H. ; Huang, Z. H. ; Richardson, J. D. ; Kan, J. R.
刊名	Journal of Geophysical Research-Space Physics
	2009
卷号	114 页码:A05211
关键词	wind dynamic pressure steady-state response low-latitude stations solar-wind geosynchronous orbit geomagnetic-field sudden impulses
ISSN号	0148-0227
通讯作者	北京8701信箱
英文摘要	We perform a statistical survey of geospace magnetic field responses, including the geosynchronous magnetic field and the sudden impulses on the ground, to interplanetary shocks (IP shocks) between 1998 and 2005. The magnitude of the geosynchronous magnetic field (dB(z)) responses to IP shocks depends strongly on local time, which peaks near the noon meridian; however, the relative magnitude of the responses depends only weakly on local time. These results are similar to those obtained from the statical study of the responses to solar wind dynamic pressure pulses. However, negative responses (where dBz is negative) were sometimes observed in the nightside of the magnetosphere even though the IP shocks always caused increases in the solar wind dynamic pressure, a new phenomenon not widely reported in the literature. Our analysis shows that similar to 75% of negative responses in the midnight sector are associated with southward interplanetary magnetic field. For a moderately compressed magnetosphere, the amplitude of the geosynchronous response dBz could be determined by the average value of the background local magnetic field. As the magnitude of the upstream solar wind dynamic pressure increases, the rate of response increases correspondingly. The dBz at the geosynchronous orbit near local noon and the amplitude of sudden impulses (dSYM-H) on the ground are highly correlated.
学科主题	空间物理
收录类别	SCI
原文出处	http://www.agu.org/pubs/crossref/2009/2008JA013794.shtml
语种	英语
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/1146]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Wang, C.,Liu, J. B.,Li, H.,et al. Geospace magnetic field responses to interplanetary shocks[J]. Journal of Geophysical Research-Space Physics,2009,114:A05211.
APA	Wang, C.,Liu, J. B.,Li, H.,Huang, Z. H.,Richardson, J. D.,&Kan, J. R..(2009).Geospace magnetic field responses to interplanetary shocks.Journal of Geophysical Research-Space Physics,114,A05211.
MLA	Wang, C.,et al."Geospace magnetic field responses to interplanetary shocks".Journal of Geophysical Research-Space Physics 114(2009):A05211.