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题名: On the propagation of a geoeffective coronal mass ejection during 15-17 March 2015
作者: Wang, Yuming; Zhang, Quanhao; Liu, Jiajia; Shen, Chenglong; Shen, Fang; Yang, Zicai; Zic, T.; Vrsnak, B.; Webb, D. F.; Liu, Rui; Wang, S.; Zhang, Jie; Hu, Qiang; Zhuang, Bin
作者部门: 空间科学部
通讯作者: Wang, YM (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei, Peoples R China. ; Wang, YM (reprint author), Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei, Peoples R China.
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN号: 2169-9380
出版日期: 2016
卷号: 121, 期号:8, 页码:7423-7434
收录类别: SCI
项目资助者: NSFC [41131065, 41421063, 41222031] ; CAS [KZZD-EW-01] ; fundamental research funds for the central universities ; MOST 973 key project [2012CB825601] ; Croatian Science Foundation [6212] ; [NSFC41574165] ; [NSFC41274173] ; [NSFC41474152]
英文摘要: The largest geomagnetic storm so far, called 2015 St. Patrick's Day event, in the solar cycle 24 was produced by a fast coronal mass ejection (CME) originating on 15 March 2015. It was an initially west-oriented CME and expected to only cause a weak geomagnetic disturbance. Why did this CME finally cause such a large geomagnetic storm? We try to find some clues by investigating its propagation from the Sun to 1 AU. First, we reconstruct the CME's kinematic properties in the corona from the SOHO and Solar Dynamics Observatory imaging data with the aid of the graduated cylindrical shell model. It is suggested that the CME propagated to the west similar to 33 degrees +/- 10 degrees away from the Sun-Earth line with a speed of about 817 km s(-1) before leaving the field of view of the SOHO/Large Angle and Spectrometric Coronagraph (LASCO) C3 camera. A magnetic cloud (MC) corresponding to this CME was measured in situ by the Wind spacecraft 2 days after the CME left LASCO's field of view. By applying two MC reconstruction methods, we infer the configuration of the MC as well as some kinematic information, which implies that the CME possibly experienced an eastward deflection on its way to 1 AU. However, due to the lack of observations from the STEREO spacecraft, the CME's kinematic evolution in interplanetary space is not clear. In order to fill this gap, we utilize numerical MHD simulation, drag-based CME propagation model (DBM) and the model for CME deflection in interplanetary space (DIPS) to recover the propagation process, especially the trajectory, of the CME from 30R(S) to 1 AU under the constraints of the derived CME's kinematics near the Sun and at 1 AU. It is suggested that the trajectory of the CME was deflected toward the Earth by about 12 degrees, consistent with the implication from the MC reconstruction at 1 AU. This eastward deflection probably contributed to the CME's unexpected geoeffectiveness by pushing the center of the initially west-oriented CME closer to the Earth.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5632
Appears in Collections:空间科学部_期刊论文

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