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NONLINEAR FORCE-FREE FIELD EXTRAPOLATION OF A CORONAL MAGNETIC FLUX ROPE SUPPORTING A LARGE-SCALE SOLAR FILAMENT FROM A PHOTOSPHERIC VECTOR MAGNETOGRAM
Jiang, Chaowei; Wu, S. T.; Feng, Xueshang; Hu, Qiang; Jiang, CW (reprint author), Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsville, AL 35899 USA.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2014
Volume786Issue:2Pages:L16
ISSN2041-8205
Language英语
KeywordMagnetic Fields Magnetohydrodynamics ( Mhd) Methods: Numerical Sun: Corona Sun: Filaments Prominences
AbstractSolar filaments are commonly thought to be supported inmagnetic dips, in particular, in those ofmagnetic flux ropes (FRs). In this Letter, based on the observed photospheric vector magnetogram, we implement a nonlinear force-free field (NLFFF) extrapolation of a coronal magnetic FR that supports a large-scale intermediate filament between an active region and a weak polarity region. This result is a first, in the sense that current NLFFF extrapolations including the presence of FRs are limited to relatively small-scale filaments that are close to sunspots and along main polarity inversion lines (PILs) with strong transverse field and magnetic shear, and the existence of an FR is usually predictable. In contrast, the present filament lies along the weak-field region (photospheric field strength less than or similar to 100 G), where the PIL is very fragmented due to small parasitic polarities on both sides of the PIL and the transverse field has a low signal-to-noise ratio. Thus, extrapolating a large-scale FR in such a case represents a far more difficult challenge. We demonstrate that our CESE-MHD-NLFFF code is sufficient for the challenge. The numerically reproduced magnetic dips of the extrapolated FR match observations of the filament and its barbs very well, which strongly supports the FR-dip model for filaments. The filament is stably sustained because the FR is weakly twisted and strongly confined by the overlying closed arcades.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/2754
Collection空间科学部
Corresponding AuthorJiang, CW (reprint author), Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsville, AL 35899 USA.
Recommended Citation
GB/T 7714
Jiang, Chaowei,Wu, S. T.,Feng, Xueshang,et al. NONLINEAR FORCE-FREE FIELD EXTRAPOLATION OF A CORONAL MAGNETIC FLUX ROPE SUPPORTING A LARGE-SCALE SOLAR FILAMENT FROM A PHOTOSPHERIC VECTOR MAGNETOGRAM[J]. ASTROPHYSICAL JOURNAL LETTERS,2014,786(2):L16.
APA Jiang, Chaowei,Wu, S. T.,Feng, Xueshang,Hu, Qiang,&Jiang, CW .(2014).NONLINEAR FORCE-FREE FIELD EXTRAPOLATION OF A CORONAL MAGNETIC FLUX ROPE SUPPORTING A LARGE-SCALE SOLAR FILAMENT FROM A PHOTOSPHERIC VECTOR MAGNETOGRAM.ASTROPHYSICAL JOURNAL LETTERS,786(2),L16.
MLA Jiang, Chaowei,et al."NONLINEAR FORCE-FREE FIELD EXTRAPOLATION OF A CORONAL MAGNETIC FLUX ROPE SUPPORTING A LARGE-SCALE SOLAR FILAMENT FROM A PHOTOSPHERIC VECTOR MAGNETOGRAM".ASTROPHYSICAL JOURNAL LETTERS 786.2(2014):L16.
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