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Formation and Eruption of a Mini-sigmoid Originating in Coronal Hole
Huang, Z. W.1,2; Cheng, X.1,2; Su, Y. N.3,4; Liu, T.3,4; Ding, M. D.1,2
2019-12-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume887Issue:2Pages:11
Corresponding AuthorHuang, Z. W.(Huangzw@smail.nju.edu.cn)
AbstractIn this paper, we study in detail the evolution of a mini-sigmiod originating in a cross-equatorial coronal hole, where the magnetic field is mostly open and seriously distinct from the closed background field above active-region sigmoids. The source region first appeared as a bipole, which subsequently experienced a rapid emergence followed by a long-term decay. Correspondingly, the coronal structure initially appeared as arc-like loops, then gradually sheared and transformed into continuously sigmoidal loops, mainly owing to flux cancellation near the polarity inversion line. The temperature of J-shaped and sigmoidal loops is estimated to be about 2.0 x 10(6) K, greater than that of the background coronal hole. Using the flux-rope insertion method, we further reconstruct the nonlinear force-free fields that well reproduces the transformation of the potential field into a sigmoidal field. The fact that the sheared and sigmoidal loops are mainly concentrated at around the high-Q region implies that the reconnection most likely takes place there to form the sigmoidal field and heat the plasma. Moreover, the twist of sigmoidal field lines is estimated to be around 0.8, less than the values derived for the sigmoids from active regions. However, the sigmoidal flux may quickly enter an unstable regime at the very low corona (<10 Mm) due to the open background field. The results suggest that the mini-sigmoid, at least the one in our study, has the same formation and eruption process as the large-scale one, but is significantly influenced by the overlying flux.
DOI10.3847/1538-4357/ab4f83
WOS KeywordQUASI-SEPARATRIX LAYERS ; MAGNETIC-FLUX ROPES ; SOLAR ACTIVE-REGION ; SOFT-X-RAY ; HEMISPHERIC PATTERN ; KINK INSTABILITY ; MASS EJECTION ; FILAMENT ; EMERGENCE ; EVOLUTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000506012000024
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35388
Collection中国科学院紫金山天文台
Corresponding AuthorHuang, Z. W.
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Sci, Nanjing 210008, Peoples R China
4.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Huang, Z. W.,Cheng, X.,Su, Y. N.,et al. Formation and Eruption of a Mini-sigmoid Originating in Coronal Hole[J]. ASTROPHYSICAL JOURNAL,2019,887(2):11.
APA Huang, Z. W.,Cheng, X.,Su, Y. N.,Liu, T.,&Ding, M. D..(2019).Formation and Eruption of a Mini-sigmoid Originating in Coronal Hole.ASTROPHYSICAL JOURNAL,887(2),11.
MLA Huang, Z. W.,et al."Formation and Eruption of a Mini-sigmoid Originating in Coronal Hole".ASTROPHYSICAL JOURNAL 887.2(2019):11.
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