Geoeffective analysis of CMEs under current sheet magnetic coordinates

	Geoeffective analysis of CMEs under current sheet magnetic coordinates
	Feng XS(冯学尚) ; Zhao XH(赵新华)
刊名	Astrophysics and Space Science
	2006
卷号	305 期号:1 页码:37-47
关键词	coronal mass ejections current sheet magnetic coordinate geomagnetic storm intensity transit time prediction method heliospheric plasma sheet interplanetary shock geomagnetic storms solar-wind source regions 1 au propagation disturbances earth
ISSN号	0004-640X
通讯作者	北京8701信箱
英文摘要	Using 100 CME-ICME events during 1997.01-2002.11, based on the eruptive source locations of CMEs and solar magnetic field observations at the photosphere, a current sheet magnetic coordinate (CMC) system is established in order to statistically study the characteristics of the CME-ICME events and the corresponding geomagnetic storm intensity. The transit times of CMEs from the Sun to the Earth are also investigated, by taking into account of the angle between the CME eruption normal (defined as the vector from the Sun center to the CME eruption source) and the Sun-Earth line. Our preliminary conclusions are: 1. The distribution of the CME sources in our CMC system is obviously different from that in the ordinary heliographic coordinate system. The sources of CMEs are mainly centralized near the heliospheric current sheet (HCS), and the number of events decreases with the increment of the angular distance from the CME source to the HCS on the solar surface; 2. A large portion of the total events belong to the same-side events (referring to the CME source located on the same side of the HCS as the Earth), while only a small portion belong to the opposite-side events (the CME source located on the opposite side of the HCS as the Earth). 3. The intense geomagnetic storms are usually induced by the same-side events, while the opposite side events are commonly associated with relatively weak geomagnetic storms; 4. The angle between the CME normal and the Sun-Earth line is used to estimate the transit time of the CME in order to reflect the influence of propagation characteristic of the CME along the Sun-Earth direction. With our new prediction method in context of the CMC coordinate, the averaged absolute error for these 100 events is 10.33 hours and the resulting relative error is not larger than 30% for 91% of all the events.
学科主题	空间物理
收录类别	SCI
原文出处	http://www.springerlink.com/content/y6157274n12n5t63/fulltext.pdf
语种	英语
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/1064]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Feng XS,Zhao XH. Geoeffective analysis of CMEs under current sheet magnetic coordinates[J]. Astrophysics and Space Science,2006,305(1):37-47.
APA	冯学尚,&赵新华.(2006).Geoeffective analysis of CMEs under current sheet magnetic coordinates.Astrophysics and Space Science,305(1),37-47.
MLA	冯学尚,et al."Geoeffective analysis of CMEs under current sheet magnetic coordinates".Astrophysics and Space Science 305.1(2006):37-47.