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The Structure of Solar Coronal Mass Ejections in the Extreme-ultraviolet Passbands
Song,H. Q.1; Zhang,J.2; Li,L. P.3; Liu,Y. D.4; Zhu,B.4; Wang,B.1; Zheng,R. S.1; Chen,Y.1
2019-12-16
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume887Issue:2
AbstractAbstract So far, most studies on the structure of coronal mass ejections (CMEs) are conducted through white-light coronagraphs, demonstrating that about one third of CMEs exhibit the typical three-part structure in the high corona (e.g., beyond 2 ), i.e., the bright front, the dark cavity, and the bright core. In this paper, we address the CME structure in the low corona (e.g., below 1.3 ) through extreme-ultraviolet (EUV) passbands and find that the three-part CMEs in the white-light images can possess a similar three-part appearance in the EUV images, i.e., a leading edge, a low-density zone, and a filament or hot channel. The analyses identify that the leading edge and the filament or hot channel in the EUV passbands evolve into the front and the core later within several solar radii in the white-light passbands, respectively. What is more, we find that the CMEs without an obvious cavity in the white-light images can also exhibit the clear three-part appearance in the EUV images, which means that the low-density zone in the EUV images (observed as the cavity in white-light images) can be compressed and/or transformed gradually by the expansion of the bright core and/or the reconnection of the magnetic field surrounding the core during the CME propagation outward. Our study suggests that more CMEs can possess the clear three-part structure in their early eruption stage. The nature of the low-density zone between the leading edge and the filament or hot channel is discussed.
KeywordSolar coronal mass ejections Solar filament eruptions Solar magnetic reconnection Solar coronal mass ejection shocks Solar extreme ultraviolet emission
DOI10.3847/1538-4357/ab50b6
Language英语
WOS IDIOP:0004-637X-887-2-ab50b6
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28674
Collection中国科学院国家天文台
Affiliation1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, and Institute of Space Sciences, Shandong University, Weihai, Shandong 264209, People’s Republic of China; hqsong@sdu.edu.cn
2.Department of Physics and Astronomy, George Mason University, Fairfax, VA 22030, USA
3.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China
4.State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
Recommended Citation
GB/T 7714
Song,H. Q.,Zhang,J.,Li,L. P.,et al. The Structure of Solar Coronal Mass Ejections in the Extreme-ultraviolet Passbands[J]. The Astrophysical Journal,2019,887(2).
APA Song,H. Q..,Zhang,J..,Li,L. P..,Liu,Y. D..,Zhu,B..,...&Chen,Y..(2019).The Structure of Solar Coronal Mass Ejections in the Extreme-ultraviolet Passbands.The Astrophysical Journal,887(2).
MLA Song,H. Q.,et al."The Structure of Solar Coronal Mass Ejections in the Extreme-ultraviolet Passbands".The Astrophysical Journal 887.2(2019).
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