Multi-spacecraft Observations of the Rotation and Nonradial Motion of a CME Flux Rope Causing an Intense Geomagnetic Storm

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	Multi-spacecraft Observations of the Rotation and Nonradial Motion of a CME Flux Rope Causing an Intense Geomagnetic Storm
	Liu, Yi A.; Liu, Ying D.; Hu, Huidong; Wang, Rui; Zhao, Xiaowei; 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.
作者部门	空间科学部
发表期刊	ASTROPHYSICAL JOURNAL
	2018
卷号	854 期号:2 页码:126
ISSN	0004-637X
语种	英语
关键词	Solar-terrestrial Relations Sun: Activity Sun: Coronal Mass Ejections(Cmes) Sun: Magnetic Fields
摘要	We present an investigation of the rotation and nonradial motion of a coronal mass ejection (CME) from AR 12468 on 2015 December 16 using observations from SDO, SOHO, STEREO A, and Wind. The EUV and HMI observations of the source region show that the associated magnetic flux rope (MFR) axis pointed to the east before the eruption. We use a nonlinear force-free field (NLFFF) extrapolation to determine the configuration of the coronal magnetic field and calculate the magnetic energy density distributions at different heights. The distribution of the magnetic energy density shows a strong gradient toward the northeast. The propagation direction of the CME from a Graduated Cylindrical Shell (GCS) modeling deviates from the radial direction of the source region by about 45 degrees in longitude and about 30 degrees in latitude, which is consistent with the gradient of the magnetic energy distribution around the AR. The MFR axis determined by the GCS modeling points southward, which has rotated counterclockwise by about 95 degrees compared with the orientation of the MFR in the low corona. The MFR reconstructed by a Grad-Shafranov (GS) method at 1 au has almost the same orientation as the MFR from the GCS modeling, which indicates that the MFR rotation occurred in the low corona. It is the rotation of the MFR that caused the intense geomagnetic storm with the minimum D-st of - 155 nT. These results suggest that the coronal magnetic field surrounding the MFR plays a crucial role in the MFR rotation and propagation direction.
收录类别	SCI
文献类型	期刊论文
条目标识符	http://ir.nssc.ac.cn/handle/122/6202
专题	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.
推荐引用方式 GB/T 7714	Liu, Yi A.,Liu, Ying D.,Hu, Huidong,et al. Multi-spacecraft Observations of the Rotation and Nonradial Motion of a CME Flux Rope Causing an Intense Geomagnetic Storm[J]. ASTROPHYSICAL JOURNAL,2018,854(2):126.
APA	Liu, Yi A..,Liu, Ying D..,Hu, Huidong.,Wang, Rui.,Zhao, Xiaowei.,...&Liu, YD .(2018).Multi-spacecraft Observations of the Rotation and Nonradial Motion of a CME Flux Rope Causing an Intense Geomagnetic Storm.ASTROPHYSICAL JOURNAL,854(2),126.
MLA	Liu, Yi A.,et al."Multi-spacecraft Observations of the Rotation and Nonradial Motion of a CME Flux Rope Causing an Intense Geomagnetic Storm".ASTROPHYSICAL JOURNAL 854.2(2018):126.

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