Contribution of the partial ring current to the SYMH index during magnetic storms

	Contribution of the partial ring current to the SYMH index during magnetic storms
	Li, H.; Wang, C.; Kan, J. R.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2011
卷号	116 页码:A11222
ISSN号	0148-0227
通讯作者	Li, H (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, POB 8701, Beijing 100190, Peoples R China.
中文摘要	To identify which magnetospheric current system contributes the most to the SYMH index during magnetic storms, we performed a statistical analysis of 299 magnetic storms from 1996 to 2006 and investigated the distribution of the H depressions with magnetic local times (MLT), by using data from 25 geomagnetic stations distributed almost uniformly in magnetic longitudes over magnetic latitudes ranging from 9 degrees to 45 degrees. As expected, a significant dawn-dusk asymmetry of H depression during the storm main phase and early recovery phase reveals the importance of the partial ring current during magnetic storm processes. The location, evolution, and quantitative contribution of the partial ring current during magnetic storms with different intensities are all further obtained. The partial ring current locates in the dusk sector, peaking in 18:00 similar to 20:00 MLT. It forms in the early main phase, increases gradually until the SYMH index reaches its minimum, and then quickly decreases in the recovery phase. The contribution of the partial ring current weakens gradually as the storm intensity increases. For moderate (-100 < SYMH <= -50 nT) and intense (-300 < SYMH <= -100 nT) storms, the partial ring current is the predominant contributor during the main phase. However, the partial ring current is no longer the predominant contributor for the super storms with SYMH <= -300 nT, which may suggest the saturation of the partial ring current under extreme solar wind conditions.
英文摘要	To identify which magnetospheric current system contributes the most to the SYMH index during magnetic storms, we performed a statistical analysis of 299 magnetic storms from 1996 to 2006 and investigated the distribution of the H depressions with magnetic local times (MLT), by using data from 25 geomagnetic stations distributed almost uniformly in magnetic longitudes over magnetic latitudes ranging from 9 degrees to 45 degrees. As expected, a significant dawn-dusk asymmetry of H depression during the storm main phase and early recovery phase reveals the importance of the partial ring current during magnetic storm processes. The location, evolution, and quantitative contribution of the partial ring current during magnetic storms with different intensities are all further obtained. The partial ring current locates in the dusk sector, peaking in 18:00 similar to 20:00 MLT. It forms in the early main phase, increases gradually until the SYMH index reaches its minimum, and then quickly decreases in the recovery phase. The contribution of the partial ring current weakens gradually as the storm intensity increases. For moderate (-100 < SYMH <= -50 nT) and intense (-300 < SYMH <= -100 nT) storms, the partial ring current is the predominant contributor during the main phase. However, the partial ring current is no longer the predominant contributor for the super storms with SYMH <= -300 nT, which may suggest the saturation of the partial ring current under extreme solar wind conditions.
学科主题	空间物理
收录类别	SCI
资助信息	NNSFC [40921063, 40831060, 40974106]; 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/122/3227]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Li, H.,Wang, C.,Kan, J. R.. Contribution of the partial ring current to the SYMH index during magnetic storms[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A11222.
APA	Li, H.,Wang, C.,&Kan, J. R..(2011).Contribution of the partial ring current to the SYMH index during magnetic storms.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A11222.
MLA	Li, H.,et al."Contribution of the partial ring current to the SYMH index during magnetic storms".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A11222.