Formation and Eruption of a Mini-sigmoid Originating in Coronal Hole
文献类型：期刊论文
| 作者 | Huang, Z. W.3,4; Cheng, X.3,4; Su, Y. N.1,2; Liu, T.1,2; Ding, M. D.3,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-12-20 |
| 卷号 | 887期号:2页码:11 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab4f83 |
| 通讯作者 | Huang, Z. W.(Huangzw@smail.nju.edu.cn) |
| 英文摘要 | In 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. |
| WOS关键词 | QUASI-SEPARATRIX LAYERS ; MAGNETIC-FLUX ROPES ; SOLAR ACTIVE-REGION ; SOFT-X-RAY ; HEMISPHERIC PATTERN ; KINK INSTABILITY ; MASS EJECTION ; FILAMENT ; EMERGENCE ; EVOLUTION |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000506012000024 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/35387]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Huang, Z. W. |
| 作者单位 | 1.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Sci, Nanjing 210008, Peoples R China 3.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Peoples R China 4.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China |
| 推荐引用方式 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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来源：紫金山天文台
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