AN MHD MODEL FOR MAGNETAR GIANT FLARES

	AN MHD MODEL FOR MAGNETAR GIANT FLARES
	Meng Y(蒙盈)1,2 ; Lin J(林隽)1 ; Zhang, L3 ; Reeves, KK 4; Zhang QS(张钱生)1,5 ; Yuan, F 6
刊名	ASTROPHYSICAL JOURNAL
	2014-04-10
卷号	785 期号:1
关键词	instabilities magnetic reconnection magnetohydrodynamics (MHD) stars: flare stars: magnetic field stars: neutron
ISSN号	0004-637X
通讯作者	Meng, Y (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
产权排序	第一完成单位
英文摘要	Giant flares on soft gamma-ray repeaters that are thought to take place on magnetars release enormous energy in a short time interval. Their power can be explained by catastrophic instabilities occurring in the magnetic field configuration and the subsequent magnetic reconnection. By analogy with the coronal mass ejection events on the Sun, we develop a theoretical model via an analytic approach for magnetar giant flares. In this model, the rotation and/or displacement of the crust causes the field to twist and deform, leading to flux rope formation in the magnetosphere and energy accumulation in the related configuration. When the energy and helicity stored in the configuration reach a threshold, the system loses its equilibrium, the flux rope is ejected outward in a catastrophic way, and magnetic reconnection helps the catastrophe develop to a plausible eruption. By taking SGR 1806-20 as an example, we calculate the free magnetic energy released in such an eruptive process and find that it is more than 10(47) erg, which is enough to power a giant flare. The released free magnetic energy is converted into radiative energy, kinetic energy, and gravitational energy of the flux rope. We calculated the light curves of the eruptive processes for the giant flares of SGR 1806-20, SGR 0526-66, and SGR 1900+14, and compared them with the observational data. The calculated light curves are in good agreement with the observed light curves of giant flares.
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]	CORONAL MASS EJECTIONS ; CRUSTAL PLATE-TECTONICS ; SOFT GAMMA-REPEATERS ; X-RAY PULSAR ; FLUX-ROPE MODELS ; SOLAR ERUPTIONS ; NEUTRON-STARS ; SGR 1900+14 ; PARTICLE-ACCELERATION ; RADIATIVE MECHANISM
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/785/1/62/meta
语种	英语
WOS记录号	WOS:000335639300062
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6255]
专题	云南天文台_太阳物理研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China 2.University of Chinese Academy of Sciences, Beijing 100039, China 3.Department of Physics, Yunnan University, Kunming, Yunnan 650091, China 4.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA 5.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, Yunnan 650011, China 6.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China
推荐引用方式 GB/T 7714	Meng Y,Lin J,Zhang, L,et al. AN MHD MODEL FOR MAGNETAR GIANT FLARES[J]. ASTROPHYSICAL JOURNAL,2014,785(1).
APA	Meng Y,Lin J,Zhang, L,Reeves, KK,Zhang QS,&Yuan, F.(2014).AN MHD MODEL FOR MAGNETAR GIANT FLARES.ASTROPHYSICAL JOURNAL,785(1).
MLA	Meng Y,et al."AN MHD MODEL FOR MAGNETAR GIANT FLARES".ASTROPHYSICAL JOURNAL 785.1(2014).