Magnetar Giant Flares in Multipolar Magnetic Fields. III. Multipolar Magnetic Field Structure Variations
文献类型：期刊论文
| 作者 | Yao, Guang-Rui1,2; Huang, Lei1,3; Yu, Cong4; Shen, Zhi-Qiang1,3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018-02-10 |
| 卷号 | 854期号:1页码:7 |
| ISSN号 | 0004-637X |
| 关键词 | instabilities pulsars: general stars: magnetars stars: magnetic field stars: neutron |
| DOI | 10.3847/1538-4357/aaa480 |
| 通讯作者 | Yao, Guang-Rui() |
| 英文摘要 | We 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. |
| WOS关键词 | SOFT GAMMA-REPEATERS ; X-RAY PULSARS ; NEUTRON-STARS ; SGR-1806-20 ; BURSTS ; ELECTRODYNAMICS ; EMISSION |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000424362500001 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/22307]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Yao, Guang-Rui |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。