Lorentz force: A possible driving force for sunspot rotation
文献类型：期刊论文
| 作者 | Su, Jiangtao1 ; Liu, Yu2; Liu, Jihong3; Mao, Xinjie4; Zhang, Hongqi1; Li, Hui5; Wang, Xiaofan1; Xie, Wenbin1
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| 刊名 | SOLAR PHYSICS
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| 出版日期 | 2008-10-01 |
| 卷号 | 252期号:1页码:55-71 |
| 关键词 | Sun, convection magnetic fields magnetic force |
| 英文摘要 | Zhao and Kosovichev (Astrophys. J. 591, 446, 2003) found two opposite sub-photospheric vortical flows in the depth range of 0-12 Mm around a fast rotating sunspot. So far there is no theoretical model explaining such flow motions. In this paper, we try to explain this phenomenon from the point of view of magnetic flux tubes interacting with large-scale vortical motions of plasma. In the deeper zone under the photosphere, the magnetic force may be less than the nonmagnetic force of plasma. The vortical flow located there twists the flux tube and magnetic free energy is built up in the tube. In the shallower zone under the photosphere, the magnetic force may be greater than the nonmagnetic force. Thus, part of the stored magnetic free energy is released to drive the plasma to rotate in two opposite directions, e.g., in the depth ranges of 0-3(5) and 9-12 Mm. In addition, we also define a vector of nonpotential magnetic stress tau, which can be related to flare occurrence. It is calculated for the active region NOAA 10930 on 11 December 2006. We find that: i) the integral of its line-of-sight (LOS) stress successively increases around the magnetic neutral line (MNL) prior to and during the flare and decreases to a minimum after the flare; ii) the integral of its transverse stress exceeds the integral of its LOS component by one order of magnitude over the whole field of view; iii) the transverse stress first points toward the MNL, then along it, and finally it points away from it. We need other data to verify whether or not the magnetic energy is transported in the horizontal direction to the neutral line, and then partly changes into the energy in LOS direction before and during the flare. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000259677500005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7384]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA 3.Shi Jiazhuang Univ, Dept Phys, Shijiazhuang 050081, Peoples R China 4.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Su, Jiangtao,Liu, Yu,Liu, Jihong,et al. Lorentz force: A possible driving force for sunspot rotation[J]. SOLAR PHYSICS,2008,252(1):55-71. |
| APA | Su, Jiangtao.,Liu, Yu.,Liu, Jihong.,Mao, Xinjie.,Zhang, Hongqi.,...&Xie, Wenbin.(2008).Lorentz force: A possible driving force for sunspot rotation.SOLAR PHYSICS,252(1),55-71. |
| MLA | Su, Jiangtao,et al."Lorentz force: A possible driving force for sunspot rotation".SOLAR PHYSICS 252.1(2008):55-71. |
入库方式： OAI收割
来源：国家天文台
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