MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS

	MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS
	Yu C(余聪)1,2 ; Huang, L 3,4
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2013-07
卷号	771 期号:2 页码:46-50
关键词	instabilities pulsars: general stars: magnetars stars: magnetic field stars: neutron
ISSN号	2041-8205
通讯作者	Yu, C (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	We propose a catastrophic magnetospheric model for magnetar precursors and their successive giant flares. Axisymmetric models of the magnetosphere, which contain both a helically twisted flux rope and a current sheet, are established based on force-free field configurations. In this model, the helically twisted flux rope would lose its equilibrium and erupt abruptly in response to the slow and quasi-static variations at the ultra-strongly magnetized neutron star's surface. In a previous model without current sheets, only one critical point exists in the flux rope equilibrium curve. New features show up in the equilibrium curves for the flux rope when current sheets appear in the magnetosphere. The causal connection between the precursor and the giant flare, as well as the temporary re-entry of the quiescent state between the precursor and the giant flare, can be naturally explained. Magnetic energy would be released during the catastrophic state transitions. The detailed energetics of the model are also discussed. The current sheet created by the catastrophic loss of equilibrium of the flux rope provides an ideal place for magnetic reconnection. We point out the importance of magnetic reconnection for further enhancement of the energy release during eruptions.
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]	X-RAY PULSAR ; REPEATERS ; ELECTRODYNAMICS ; EMISSION ; BURSTS ; FIELDS
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/2041-8205/771/2/L46/meta
语种	英语
WOS记录号	WOS:000321036000028
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4551]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories/Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Key Laboratory for the Structure and Evolution of Celestial Object, Chinese Academy of Sciences, Kunming 650011, China 3.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China 4.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, China
推荐引用方式 GB/T 7714	Yu C,Huang, L. MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS[J]. ASTROPHYSICAL JOURNAL LETTERS,2013,771(2):46-50.
APA	Yu C,&Huang, L.(2013).MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS.ASTROPHYSICAL JOURNAL LETTERS,771(2),46-50.
MLA	Yu C,et al."MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS".ASTROPHYSICAL JOURNAL LETTERS 771.2(2013):46-50.