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题名: TWIST ACCUMULATION AND TOPOLOGY STRUCTURE OF A SOLAR MAGNETIC FLUX ROPE
作者: Guo, Y.1, 2; Ding, M. D.1, 2; Cheng, X.1, 2; Zhao, J.3; Pariat, E.4
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2013-12-20
卷号: 779, 期号:2
关键词: magnetic fields ; Sun: corona ; Sun: flares ; Sun: UV radiation
DOI: 10.1088/0004-637X/779/2/157
文章类型: Article
英文摘要: To 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: CORONAL MASS EJECTIONS ; QUASI-SEPARATRIX LAYERS ; LOCAL CORRELATION TRACKING ; ACTIVE-REGION 10953 ; VECTOR MAGNETOGRAMS ; INDUCTION EQUATION ; HELICITY INJECTION ; TORUS INSTABILITY ; CONFINED ERUPTION ; FIELD STRENGTH
收录类别: SCI
语种: 英语
WOS记录号: WOS:000328187200066
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15527
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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作者单位: 1.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
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