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AN MHD MODEL FOR MAGNETAR GIANT FLARES
Meng Y(蒙盈)1,2; Lin J(林隽)1; Zhang, L3; Reeves, KK4; Zhang QS(张钱生)1,5; Yuan, F6; Meng, Y (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2014-04-10
卷号785期号:1
DOI10.1088/0004-637X/785/1/62
产权排序第1完成单位
收录类别SCI
关键词Instabilities Magnetic Reconnection Magnetohydrodynamics (Mhd) Stars: Flare Stars: Magnetic Field Stars: Neutron
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.
项目资助者Program 973 [2011CB811403, 2013CBA01503] ; NSFC [11273055, 11333007, 11121062, 11133005] ; CAS [KJCX2-EW-T07, XDB09000000] ; NSF [AGS-1156076]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2014-06-23
WOS记录号WOS:000335639300062
WOS研究方向Astronomy & Astrophysics
WOS类目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
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6255
专题太阳物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Meng, Y (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
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
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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.,...&Meng, Y .(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).
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