PMO OpenIR  > 分子云与恒星形成研究团组
TWIST ACCUMULATION AND TOPOLOGY STRUCTURE OF A SOLAR MAGNETIC FLUX ROPE
Guo, Y.1,2; Ding, M. D.1,2; Cheng, X.1,2; Zhao, J.3; Pariat, E.4
2013-12-20
Source PublicationASTROPHYSICAL JOURNAL
Volume779Issue:2
AbstractTo study the buildup of a magnetic flux rope before a major flare and coronal mass ejection (CME), we compute the magnetic helicity injection, twist accumulation, and topology structure of the three-dimensional (3D) magnetic field, which is derived by the nonlinear force-free field model. The Extreme-ultraviolet Imaging Telescope on board the Solar and Heliospheric Observatory observed a series of confined flares without any CME before a major flare with a CME at 23: 02 UT on 2005 January 15 in active region NOAA 10720. We derive the vector velocity at eight time points from 18: 27 UT to 22: 20 UT with the differential affine velocity estimator for vector magnetic fields, which were observed by the Digital Vector Magnetograph at Big Bear Solar Observatory. The injected magnetic helicity is computed with the vector magnetic and velocity fields. The helicity injection rate was (-16.47+/-3.52) x 10(40) Mx(2) hr(-1). We find that only about 1.8% of the injected magnetic helicity became the internal helicity of the magnetic flux rope, whose twist increasing rate was -0.18 +/- 0.08 Turns hr(-1). The quasi-separatrix layers (QSLs) of the 3D magnetic field are computed by evaluating the squashing degree, Q. We find that the flux rope was wrapped by QSLs with large Q values, where the magnetic reconnection induced by the continuously injected magnetic helicity further produced the confined flares. We suggest that the flux rope was built up and heated by the magnetic reconnection in the QSLs.
KeywordMagnetic Fields Sun: Corona Sun: Flares Sun: Uv Radiation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/779/2/157
WOS KeywordCORONAL MASS EJECTIONS ; QUASI-SEPARATRIX LAYERS ; LOCAL CORRELATION TRACKING ; ACTIVE-REGION 10953 ; VECTOR MAGNETOGRAMS ; INDUCTION EQUATION ; HELICITY INJECTION ; TORUS INSTABILITY ; CONFINED ERUPTION ; FIELD STRENGTH
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000328187200066
Citation statistics
Cited Times:54[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15527
Collection分子云与恒星形成研究团组
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210093, Jiangsu, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
4.Univ Paris Diderot, UPMC, CNRS, LESIA,Observ Paris, F-92190 Meudon, France
Recommended Citation
GB/T 7714
Guo, Y.,Ding, M. D.,Cheng, X.,et al. TWIST ACCUMULATION AND TOPOLOGY STRUCTURE OF A SOLAR MAGNETIC FLUX ROPE[J]. ASTROPHYSICAL JOURNAL,2013,779(2).
APA Guo, Y.,Ding, M. D.,Cheng, X.,Zhao, J.,&Pariat, E..(2013).TWIST ACCUMULATION AND TOPOLOGY STRUCTURE OF A SOLAR MAGNETIC FLUX ROPE.ASTROPHYSICAL JOURNAL,779(2).
MLA Guo, Y.,et al."TWIST ACCUMULATION AND TOPOLOGY STRUCTURE OF A SOLAR MAGNETIC FLUX ROPE".ASTROPHYSICAL JOURNAL 779.2(2013).
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Guo, Y.]'s Articles
[Ding, M. D.]'s Articles
[Cheng, X.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Guo, Y.]'s Articles
[Ding, M. D.]'s Articles
[Cheng, X.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Guo, Y.]'s Articles
[Ding, M. D.]'s Articles
[Cheng, X.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.