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Magnetar Giant Flares in Multipolar Magnetic Fields. III. Multipolar Magnetic Field Structure Variations
Yao, Guang-Rui1,2; Huang, Lei1,3; Yu, Cong4; Shen, Zhi-Qiang1,3
2018-02-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume854Issue:1Pages:7
Corresponding AuthorYao, Guang-Rui()
AbstractWe have analyzed the multipolar magnetic field structure variation at neutron star surface by means of the catastrophic eruption model and find that the variation of the geometry of multipolar fields on the magnetar surface could result in the catastrophic rearrangement of the magnetosphere, which provides certain physical mechanism for the outburst of giant flares. The magnetospheric model we adopted consists of two assumptions: (1) a helically twisted flux rope is suspended in an ideal force-free magnetosphere around the magnetar, and (2) a current sheet emerges during the flux rope evolution. Magnetic energy accumulates during the flux rope's gradual evolution along with the variation of magnetar surface magnetic structure before the eruption. The two typical behaviors, either state transition or catastrophic escape, would take place once the flux rope loses equilibrium; thus, tremendous accumulated energy is radiated. We have investigated the equilibrium state of the flux rope and the energy release affected by different multipolar structures and find structures that could trigger violent eruption and provide the radiation approximately 0.5% of the total magnetic energy during the giant flare outburst. Our results provide certain multipolar structures of the neutron star's magnetic field with an energy release percentage 0.42% in the state transition and 0.51% in the catastrophic escape case, which are sufficient for the previously reported energy release from SGR 1806-20 giant flares.
Keywordinstabilities pulsars: general stars: magnetars stars: magnetic field stars: neutron
DOI10.3847/1538-4357/aaa480
WOS KeywordSOFT GAMMA-REPEATERS ; X-RAY PULSARS ; NEUTRON-STARS ; SGR-1806-20 ; BURSTS ; ELECTRODYNAMICS ; EMISSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000424362500001
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22308
Collection中国科学院紫金山天文台
Corresponding AuthorYao, Guang-Rui
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Sun Yat Sen Univ, Sch Phys & Astron, Guangzhou 519082, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Yao, Guang-Rui,Huang, Lei,Yu, Cong,et al. Magnetar Giant Flares in Multipolar Magnetic Fields. III. Multipolar Magnetic Field Structure Variations[J]. ASTROPHYSICAL JOURNAL,2018,854(1):7.
APA Yao, Guang-Rui,Huang, Lei,Yu, Cong,&Shen, Zhi-Qiang.(2018).Magnetar Giant Flares in Multipolar Magnetic Fields. III. Multipolar Magnetic Field Structure Variations.ASTROPHYSICAL JOURNAL,854(1),7.
MLA Yao, Guang-Rui,et al."Magnetar Giant Flares in Multipolar Magnetic Fields. III. Multipolar Magnetic Field Structure Variations".ASTROPHYSICAL JOURNAL 854.1(2018):7.
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