AN MHD MODEL FOR MAGNETAR GIANT FLARES
文献类型：期刊论文
| 作者 | Meng, Y.1,2; Lin, J.1; Zhang, L.3; Reeves, K. K.4; Zhang, Q. S.1,5; Yuan, F.6
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-04-10 |
| 卷号 | 785期号:1页码:62 |
| 关键词 | instabilities magnetic reconnection magnetohydrodynamics (MHD) stars: flare stars: magnetic field stars: neutron |
| 通讯作者 | 袁峰 |
| 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. |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000335639300062 |
| 公开日期 | 2015-02-14 |
| 源URL | [http://119.78.226.72//handle/331011/15700]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 上海天文台 |
| 作者单位 | 1.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China 3.Yunnan Univ, Dept Phys, Kunming 650091, Yunnan, Peoples R China 4.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 5.Chinese Acad Sci, Yunnan Astron Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China 6.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R 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):62. |
| APA | Meng, Y.,Lin, J.,Zhang, L.,Reeves, K. K.,Zhang, Q. S.,&Yuan, F..(2014).AN MHD MODEL FOR MAGNETAR GIANT FLARES.ASTROPHYSICAL JOURNAL,785(1),62. |
| MLA | Meng, Y.,et al."AN MHD MODEL FOR MAGNETAR GIANT FLARES".ASTROPHYSICAL JOURNAL 785.1(2014):62. |
入库方式： OAI收割
来源：上海天文台
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