MAGNETAR GIANT FLARES IN MULTIPOLAR MAGNETIC FIELDS. I. FULLY AND PARTIALLY OPEN ERUPTIONS OF FLUX ROPES

	MAGNETAR GIANT FLARES IN MULTIPOLAR MAGNETIC FIELDS. I. FULLY AND PARTIALLY OPEN ERUPTIONS OF FLUX ROPES
	Huang, L 1,2,3; Yu C(余聪)3,4
刊名	ASTROPHYSICAL JOURNAL
	2014-04-01
卷号	784 期号:2
关键词	instabilities pulsars: general stars: magnetars stars: magnetic field stars: neutron
ISSN号	0004-637X
通讯作者	Huang, L (reprint author), Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China.
产权排序	第四完成单位
英文摘要	We propose a catastrophic eruption model for the enormous energy release of magnetars during giant flares, in which a toroidal and helically twisted flux rope is embedded within a force-free magnetosphere. The flux rope stays in stable equilibrium states initially and evolves quasi-statically. Upon the loss of equilibrium, the flux rope cannot sustain the stable equilibrium states and erupts catastrophically. During the process, the magnetic energy stored in the magnetosphere is rapidly released as the result of destabilization of global magnetic topology. The magnetospheric energy that could be accumulated is of vital importance for the outbursts of magnetars. We carefully establish the fully open fields and partially open fields for various boundary conditions at the magnetar surface and study the relevant energy thresholds. By investigating the magnetic energy accumulated at the critical catastrophic point, we find that it is possible to drive fully open eruptions for dipole-dominated background fields. Nevertheless, it is hard to generate fully open magnetic eruptions for multipolar background fields. Given the observational importance of the multipolar magnetic fields in the vicinity of the magnetar surface, it would be worthwhile to explore the possibility of the alternative eruption approach in multipolar background fields. Fortunately, we find that flux ropes may give rise to partially open eruptions in the multipolar fields, which involve only partial opening of background fields. The energy release fractions are greater for cases with central-arcaded multipoles than those with central-caved multipoles that emerged in background fields. Eruptions would fail only when the centrally caved multipoles become extremely strong.
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 ; CORONAL MASS EJECTIONS ; NEUTRON-STARS ; SGR-1806-20 ; REPEATERS ; BURSTS ; ENERGY ; MAGNETOSPHERES ; PERSISTENT ; EVOLUTION
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/784/2/168/meta
语种	英语
WOS记录号	WOS:000335519400083
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4579]
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.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China 2.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, China 3.Key Laboratory for the Structure and Evolution of Celestial Object, Chinese Academy of Sciences, Kunming 650011, China 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
推荐引用方式 GB/T 7714	Huang, L,Yu C. MAGNETAR GIANT FLARES IN MULTIPOLAR MAGNETIC FIELDS. I. FULLY AND PARTIALLY OPEN ERUPTIONS OF FLUX ROPES[J]. ASTROPHYSICAL JOURNAL,2014,784(2).
APA	Huang, L,&Yu C.(2014).MAGNETAR GIANT FLARES IN MULTIPOLAR MAGNETIC FIELDS. I. FULLY AND PARTIALLY OPEN ERUPTIONS OF FLUX ROPES.ASTROPHYSICAL JOURNAL,784(2).
MLA	Huang, L,et al."MAGNETAR GIANT FLARES IN MULTIPOLAR MAGNETIC FIELDS. I. FULLY AND PARTIALLY OPEN ERUPTIONS OF FLUX ROPES".ASTROPHYSICAL JOURNAL 784.2(2014).