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A Stealth CME Bracketed between Slow and Fast Wind Producing Unexpected Geoeffectiveness
He, Wen; 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.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2018
Volume860Issue:1Pages:78
ISSN0004-637X
Language英语
KeywordSolar-terrestrial Relations Solar Wind Sun: Coronal Mass Ejections (Cmes)
AbstractWe investigate how a weak coronal mass ejection (CME) launched on 2016 October 8 without obvious signatures in the low corona produced a relatively intense geomagnetic storm. Remote sensing observations from SDO, STEREO, and SOHO and in situ measurements from Wind are employed to track the CME from the Sun to the Earth. Using a graduated cylindrical shell model, we estimate the propagation direction and the morphology of the CME near the Sun. CME kinematics are determined from the wide-angle imaging observations of STEREO A and are used to predict the CME arrival time and speed at the Earth. We compare ENLIL MHD simulation results with in situ measurements to illustrate the background solar wind where the CME was propagating. We also apply a Grad-Shafranov technique to reconstruct the flux-rope structure from in situ measurements in order to understand the geoeffectiveness associated with the CME magnetic field structure. Key results are obtained concerning how a weak CME can generate a relatively intense geomagnetic storm: (1) there were coronal holes at low latitudes, which could produce high speed streams (HSSs) to interact with the CME in interplanetary space; (2) the CME was bracketed between a slow wind ahead and an HSS behind, which enhanced the southward magnetic field inside the CME and gave rise to the unexpected geomagnetic storm.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6360
Collection空间科学部
Corresponding AuthorLiu, 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.
Recommended Citation
GB/T 7714
He, Wen,Liu, Ying D.,Hu, Huidong,et al. A Stealth CME Bracketed between Slow and Fast Wind Producing Unexpected Geoeffectiveness[J]. ASTROPHYSICAL JOURNAL,2018,860(1):78.
APA He, Wen.,Liu, Ying D..,Hu, Huidong.,Wang, Rui.,Zhao, Xiaowei.,...&Liu, YD .(2018).A Stealth CME Bracketed between Slow and Fast Wind Producing Unexpected Geoeffectiveness.ASTROPHYSICAL JOURNAL,860(1),78.
MLA He, Wen,et al."A Stealth CME Bracketed between Slow and Fast Wind Producing Unexpected Geoeffectiveness".ASTROPHYSICAL JOURNAL 860.1(2018):78.
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2018860178.pdf(4239KB)期刊论文作者接受稿开放获取CC BY-NC-SAApplication Full Text
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