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, Lei1,2,3 ; Yu, Cong 3,4
刊名	ASTROPHYSICAL JOURNAL
	2014-04-01
卷号	784 期号:2 页码:168
关键词	instabilities pulsars: general stars: magnetars stars: magnetic field stars: neutron
通讯作者	黄磊
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.
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
语种	英语
WOS记录号	WOS:000335519400083
公开日期	2015-02-14
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15762]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100864, Peoples R China 3.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Object, Kunming 650011, Peoples R China 4.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China
推荐引用方式 GB/T 7714	Huang, Lei,Yu, Cong. MAGNETAR GIANT FLARES IN MULTIPOLAR MAGNETIC FIELDS. I. FULLY AND PARTIALLY OPEN ERUPTIONS OF FLUX ROPES[J]. ASTROPHYSICAL JOURNAL,2014,784(2):168.
APA	Huang, Lei,&Yu, Cong.(2014).MAGNETAR GIANT FLARES IN MULTIPOLAR MAGNETIC FIELDS. I. FULLY AND PARTIALLY OPEN ERUPTIONS OF FLUX ROPES.ASTROPHYSICAL JOURNAL,784(2),168.
MLA	Huang, Lei,et al."MAGNETAR GIANT FLARES IN MULTIPOLAR MAGNETIC FIELDS. I. FULLY AND PARTIALLY OPEN ERUPTIONS OF FLUX ROPES".ASTROPHYSICAL JOURNAL 784.2(2014):168.