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题名: Propagation Characteristics of Two Coronal Mass Ejections from the Sun Far into Interplanetary Space
作者: Zhao, Xiaowei; Liu, Ying D.; Hu, Huidong; Wang, Rui
作者部门: 空间科学部
通讯作者: Liu, YD (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China. ; Liu, YD (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
关键词: shock waves ; solar wind ; Sun: coronal mass ejections (CMEs) ; Sun: heliosphere ; Sun: radio radiation
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2017
卷号: 837, 期号:1, 页码:4
收录类别: SCI
项目资助者: Global Experts of China ; NSFC [41374173] ; Specialized Research Fund for State Key Laboratories of China
英文摘要: Propagation of coronal mass ejections (CMEs) from the Sun far into interplanetary space is not well understood, due to limited observations. In this study we examine the propagation characteristics of two geo-effective CMEs, which occurred on 2005 May 6 and 13, respectively. Significant heliospheric consequences associated with the two CMEs are observed, including interplanetary CMEs (ICMEs) at the Earth and Ulysses, interplanetary shocks, a long-duration type II radio burst, and intense geomagnetic storms. We use coronagraph observations from SOHO/LASCO, frequency drift of the long-duration type II burst, in situ measurements at the Earth and Ulysses, and magnetohydrodynamic propagation of the observed solar wind disturbances at 1 au to track the CMEs from the Sun far into interplanetary space. We find that both of the CMEs underwent a major deceleration within 1 au and thereafter a gradual deceleration when they propagated from the Earth to deep interplanetary space, due to interactions with the ambient solar wind. The results also reveal that the two CMEs interacted with each other in the distant interplanetary space even though their launch times on the Sun were well separated. The intense geomagnetic storm for each case was caused by the southward magnetic fields ahead of the CME, stressing the critical role of the sheath region in geomagnetic storm generation, although for the first case there is a corotating interaction region involved.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5984
Appears in Collections:空间科学部_期刊论文

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