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MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS
Yu, Cong1,2; Huang, Lei3,4
2013-07-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume771Issue:2
AbstractWe 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.
KeywordInstabilities Pulsars: General Stars: Magnetars Stars: Magnetic Field Stars: Neutron
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/771/2/L46
WOS KeywordX-RAY PULSAR ; REPEATERS ; ELECTRODYNAMICS ; EMISSION ; BURSTS ; FIELDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000321036000028
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15529
Collection暗物质和空间天文实验室
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Peoples R China
2.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Object, Kunming 650011, Peoples R China
3.Chinese Acad, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100864, Peoples R China
Recommended Citation
GB/T 7714
Yu, Cong,Huang, Lei. MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS[J]. ASTROPHYSICAL JOURNAL LETTERS,2013,771(2).
APA Yu, Cong,&Huang, Lei.(2013).MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS.ASTROPHYSICAL JOURNAL LETTERS,771(2).
MLA Yu, Cong,et al."MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS".ASTROPHYSICAL JOURNAL LETTERS 771.2(2013).
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