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The effect of curvature on flux-rope models of coronal mass ejections
Lin J(林隽)1,2; Forbes, TG2; Isenberg, PA2; Demoulin, P3; Lin, J
发表期刊ASTROPHYSICAL JOURNAL
1998-09-10
卷号504期号:2页码:1006-1019
DOI10.1086/306108
产权排序第1完成单位
收录类别SCI
关键词Mhd Sun : Corona Sun : Flares Sun : Particle Emission
摘要The large-scale curvature of a flux rope can help propel it outward from the Sun. Here we extend previous two-dimensional flux-rope models of coronal mass ejections to include the curvature force. To obtain analytical results, we assume axial symmetry and model the flux rope as a torus that encircles the Sun. Initially, the flux rope is suspended in the corona by a balance between magnetic tension, compression, and curvature forces, but this balance is lost if the photospheric sources of the coronal field slowly decay with time. The evolution of the system shows catastrophic behavior as occurred in previous models, but, unlike the previous models, flux ropes with large radii are more likely to erupt than ones with small radii. The maximum total magnetic energy that can be stored before equilibrium is lost is 1.53 times the energy of the potential field, and this value is less than the limiting value of 1.662 for the fully opened field. As a consequence, the loss of ideal MHD equilibrium that occurs in the model cannot completely open the magnetic field. However, the loss of equilibrium does lead to the sudden formation of a current sheet, and if rapid reconnection occurs in this sheet, then the flux rope can escape from the Sun. We also find that the held can gradually become opened without suffering any loss of equilibrium if the photospheric field strength falls below a critical value. This behavior is analogous to the opening of a spherically symmetric arcade in response to a finite amount of shear.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000077777500037
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]FREE MAGNETIC-FIELDS ; ERUPTIVE FLARES ; MAXIMUM ENERGY ; EVOLUTION ; ARCADES ; EQUILIBRIUM ; REGIONS ; MOTION
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6026
专题太阳物理研究组
通讯作者Lin, J
作者单位1.Yunnan Observatory, P.O. Box 110, Kunming, YN 650011, China
2.Institute for the Study of Earth, Ocean, and Space (EOS), University of New Hampshire, Durham, NH 03824
3.Département d'Astronomie Solaire et Planétaire, Observatoire de Paris, Section de Meudon, 92195 Meudon Principal Cédex, France
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Lin J,Forbes, TG,Isenberg, PA,et al. The effect of curvature on flux-rope models of coronal mass ejections[J]. ASTROPHYSICAL JOURNAL,1998,504(2):1006-1019.
APA Lin J,Forbes, TG,Isenberg, PA,Demoulin, P,&Lin, J.(1998).The effect of curvature on flux-rope models of coronal mass ejections.ASTROPHYSICAL JOURNAL,504(2),1006-1019.
MLA Lin J,et al."The effect of curvature on flux-rope models of coronal mass ejections".ASTROPHYSICAL JOURNAL 504.2(1998):1006-1019.
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