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A criterion for magnetars producing giant flares

文献类型：期刊论文

作者Meng Y(蒙盈)1,2,3; Zhang QS(张钱生)1,4,5,6; Lin J(林隽)1,2,3,4
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2025-06
卷号540期号:1页码:319-330
关键词instabilities magnetic reconnection stars: flare stars: individual: SGR 1806-20 stars: magnetic fields stars: neutron
ISSN号0035-8711
DOI10.1093/mnras/staf765
产权排序第1完成单位
文献子类Article
英文摘要In this work, the straight flux rope in the model of giant flares on magnetars was replaced with a curved one and the equilibrium behaviour of the flux rope was investigated. Two footpoints of the flux rope are anchored to the spherical surface of magnetar. The forces acting on the flux rope include magnetic tension, magnetic pressure, curvature force, and gravity. The equilibrium in the flux rope, so as in the global configuration, is achieved as these forces offset each other. Changes in the background environment drive the configuration to evolve through a set of equilibria in a quasi-static fashion until the critical point is reached and the loss of equilibrium in the configuration occurs, invoking a giant flare. We establish a criterion to identify magnetars capable of producing giant flares. Among the four forces, the curvature force as well as the magnetic compression tend to expel the flux rope outwards. In a given magnetic configuration, the curvature force and magnetic compression are proportional to the square of the current intensity of the flux rope, which is determined by the frozen-flux condition and background magnetic field strength. We find that only when eta=GM m/((RB02)-B-4) < 0.48 is satisfied, the system reaches a critical point and potentially undergoes catastrophe. Here, G, M, m, R, and B-0 are the gravitational constant, the mass of neutron star, the mass of flux rope, the radius of neutron star, and the surface magnetic field strength of neutron star, respectively. The physical meaning of this criterion is that when eta proportional to m/B-0(2) is small enough, the curvature force and magnetic pressure can be sufficiently large to overcome gravitational confinement. This criterion establishes a basis for identifying magnetars capable of producing giant flares.
学科主题天文学 ; 太阳与太阳系
URL标识查看原文
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
WOS关键词MAGNETIZED NEUTRON-STARS ; CRUSTAL PLATE-TECTONICS ; SOFT GAMMA-REPEATERS ; CORONAL MASS EJECTIONS ; FLUX ROPE ERUPTIONS ; X-RAY PULSAR ; RADIATIVE MECHANISM ; MODEL ; SOLAR ; RECONNECTION
资助项目National Key R&D Program of China[2021YFA1600400/2021YFA1600402]; National Natural Science Foundation of China[11773064]; National Natural Science Foundation of China[12273107]; Strategic Priority Research Program of the Chinese Academy of Sciences; Foundation of the Chinese Academy of Sciences; Yunnan Province Scientist Workshop of Solar Physics; Yunnan Revitalization Talents Support Program; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001]; Yunnan Key Laboratory of Solar Physics and Space Science
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001490567600001
出版者OXFORD UNIV PRESS
资助机构National Key R&D Program of China[2021YFA1600400/2021YFA1600402] ; National Natural Science Foundation of China[11773064, 12273107] ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Foundation of the Chinese Academy of Sciences ; Yunnan Province Scientist Workshop of Solar Physics ; Yunnan Revitalization Talents Support Program ; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001] ; Yunnan Key Laboratory of Solar Physics and Space Science[202205AG070009] ; [2022YFF0503804] ; [12288102] ; [XDB 41000000]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28309]  
专题云南天文台_太阳物理研究组
云南天文台_恒星物理研究组
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, 396 Yangfangwang, Guandu District, Kunming 650216, China;
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China;
3.Yunnan Key Laboratory of Solar Physics and Space Science, Kunming, Yunnan 650216, China;
4.University of Chinese Academy of Sciences, Beijing 100049, China;
5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China;
6.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, China
推荐引用方式
GB/T 7714		 Meng Y,Zhang QS,Lin J. A criterion for magnetars producing giant flares[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2025,540(1):319-330.
APA 蒙盈,张钱生,&林隽.(2025).A criterion for magnetars producing giant flares.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,540(1),319-330.
MLA 蒙盈,et al."A criterion for magnetars producing giant flares".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 540.1(2025):319-330.

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