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题名: MAGNETAR GIANT FLARES AND THEIR PRECURSORS-FLUX ROPE ERUPTIONS WITH CURRENT SHEETS
作者: Yu, Cong1, 2; Huang, Lei3, 4
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2013-07-10
卷号: 771, 期号:2
关键词: instabilities ; pulsars: general ; stars: magnetars ; stars: magnetic field ; stars: neutron
DOI: 10.1088/2041-8205/771/2/L46
文章类型: Article
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.
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
语种: 英语
WOS记录号: WOS:000321036000028
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15529
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.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
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