NSSC OpenIR  > 空间科学部
The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning
Wei, Yong; Wan, Weixing; Pu, Zuyin; Hong, Minghua; Zong, Qiugang; Guo, Jianpeng; Zhao, Biqiang; Ren, Zhipeng; Wei, Y (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing 100012, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2011
Volume116Pages:A01211
ISSN2169-9380
Language英语
AbstractOvershielding is referred to a shielding status, during which the dawnward shielding electric field dominates over the duskward penetration electric field in the inner magnetosphere, typically appearing when the interplanetary magnetic field (IMF) suddenly turns northward after a prolonged southward orientation. It is expected that the transition to overshielding after IMF northward turning can be affected by the shape of northward turning (sharp or gradual). Moreover, the initial shielding status (undershielding or goodshielding) prior to the transition may also have influence on the transition. Here we analyze two groups of cases, in which the transitions appear after sharp (duration less than 5 min) and gradual (duration more than 30 min) northward turning. Each group includes two cases, in which the transition initiated from undershielding and goodshielding. These cases show that (1) the beginning of the transition to overshielding coincides with sharp IMF northward turning but appears in the midst of gradual IMF northward turning; (2) the transition from goodshielding to overshielding is always associated with convection electric field drop and/or polar cap shrinkage, regardless of the shape of IMF northward turning; and (3) the typical solar wind condition in which the IMF suddenly turns northward after a prolonged southward orientation is neither a necessary condition nor a sufficient condition for overshielding. Furthermore, we will discuss the effect of substorm processes on overshielding.; Overshielding is referred to a shielding status, during which the dawnward shielding electric field dominates over the duskward penetration electric field in the inner magnetosphere, typically appearing when the interplanetary magnetic field (IMF) suddenly turns northward after a prolonged southward orientation. It is expected that the transition to overshielding after IMF northward turning can be affected by the shape of northward turning (sharp or gradual). Moreover, the initial shielding status (undershielding or goodshielding) prior to the transition may also have influence on the transition. Here we analyze two groups of cases, in which the transitions appear after sharp (duration less than 5 min) and gradual (duration more than 30 min) northward turning. Each group includes two cases, in which the transition initiated from undershielding and goodshielding. These cases show that (1) the beginning of the transition to overshielding coincides with sharp IMF northward turning but appears in the midst of gradual IMF northward turning; (2) the transition from goodshielding to overshielding is always associated with convection electric field drop and/or polar cap shrinkage, regardless of the shape of IMF northward turning; and (3) the typical solar wind condition in which the IMF suddenly turns northward after a prolonged southward orientation is neither a necessary condition nor a sufficient condition for overshielding. Furthermore, we will discuss the effect of substorm processes on overshielding.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3127
Collection空间科学部
Corresponding AuthorWei, Y (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing 100012, Peoples R China.
Recommended Citation
GB/T 7714
Wei, Yong,Wan, Weixing,Pu, Zuyin,et al. The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A01211.
APA Wei, Yong.,Wan, Weixing.,Pu, Zuyin.,Hong, Minghua.,Zong, Qiugang.,...&Wei, Y .(2011).The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A01211.
MLA Wei, Yong,et al."The transition to overshielding after sharp and gradual interplanetary magnetic field northward turning".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A01211.
Files in This Item: Download All
File Name/Size DocType Version Access License
2011116A01211.pdf(584KB) 开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wei, Yong]'s Articles
[Wan, Weixing]'s Articles
[Pu, Zuyin]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wei, Yong]'s Articles
[Wan, Weixing]'s Articles
[Pu, Zuyin]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wei, Yong]'s Articles
[Wan, Weixing]'s Articles
[Pu, Zuyin]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2011116A01211.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.