The effect of curvature on flux-rope models of coronal mass ejections

	The effect of curvature on flux-rope models of coronal mass ejections
	Lin J(林隽)1,2; Forbes, TG 2; Isenberg, PA 2; Demoulin, P 3
刊名	ASTROPHYSICAL JOURNAL
	1998-09-10
卷号	504 期号:2 页码:1006-1019
关键词	MHD Sun : corona Sun : flares Sun : particle emission
ISSN号	0004-637X
通讯作者	Lin, J
产权排序	第一完成单位
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	FREE MAGNETIC-FIELDS ; ERUPTIVE FLARES ; MAXIMUM ENERGY ; EVOLUTION ; ARCADES ; EQUILIBRIUM ; REGIONS ; MOTION
收录类别	SCI
原文出处	http://iopscience.iop.org/0004-637X/504/2/1006/
语种	英语
WOS记录号	WOS:000077777500037
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6026]
专题	云南天文台_太阳物理研究组
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
推荐引用方式 GB/T 7714	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.(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.