| Coronal Magnetic Flux Rope Equilibria and Magnetic Helicity |
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| 引用本文： | You－QinHu,Yan－WeiJiang,等. Coronal Magnetic Flux Rope Equilibria and Magnetic Helicity[J]. 中国天文和天体物理学报, 2001, 1(1): 77-84 |
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| 作者姓名： | You－QinHu Yan－WeiJiang 等 |
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| 作者单位： | Department of Earth and Space Science，University of Science and Technology of China，Hefei 230026 |
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| 基金项目： | Major Project 19791090 supported by National Natural Science Foundation of China and 973 Project (G2000078404). |
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| 摘 要： | 1 INTRODUCTIONObservations show that the magnetic helicity of solar magnetic structures has a predominantsign in each hemisphere of the Sun, positive in the southern hemisphere and negative in thenorthern, regardless of the solar cycle (Rust, 1994). The magnetic helicity is strictly conservedin the frame of ideal MHD (WOltjer, 1958), and approximately conserved in the presence ofresistive dissipation and magnetic reconnection in a highly conductive plajsma (Taylor, 1974;Berger, 1984; H…
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| 关 键 词： | 太阳磁场 日冕 MHD 几何参数 太阳活动 |
Coronal Magnetic Flux Rope Equilibria and Magnetic Helicity |
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| YOu-Qiu Hu,Yan-Wei Jiang and Wei Liu. Coronal Magnetic Flux Rope Equilibria and Magnetic Helicity[J]. Chinese Journal of Astronomy and Astrophysics, 2001, 1(1): 77-84 |
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| Authors: | YOu-Qiu Hu Yan-Wei Jiang Wei Liu |
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| Affiliation: | [1]DepartmentofEarthandSpaceScience,UniversityofScienceandTechnologyofChina,Hefei230026 [2]DepartmentofEart,UniversityofScienceandTechnologyofChina,Hefei230026 |
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| Abstract: | Using a 2.5-dimensional (2.5-D) ideal MHD model, this paper analyzes the equilibrium properties of coronal magnetic flux ropes in a bipolar ambient magnetic field. It is found that the geometrical features of the magnetic flux rope,inclusing the height of the rope axis, the half-width of the rope, and the length of the vertical current sheet below the rope, are determined by a single magnetic parameter, the magnetic helicity, which is the sum of the self-helicity of the rope and the mutual helicity between the rope field and the ambient magnetic field. All the geometrical parameters increase monotonically with increasing magnetic helicity. The implication of this result in solar active phenomena is briefly discussed. |
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| Keywords: | Sun: magnetic fields - Sun: magnetic flux rope - Sun: magnetic helicity |
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