| A New Method of Identifying 3D Null Points in Solar Vector Magnetic Fields |
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| 作者姓名： | Hui Zhao Jing-Xiu Wang Jun Zhang and Chi-Jie Xiao National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| 作者单位： | Hui Zhao，Jing-Xiu Wang，Jun Zhang and Chi-Jie Xiao National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 |
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| 基金项目： | Supported by the National Natural Science Foundation of China. |
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| 摘 要： | Employing the Poincare index of isolated null-points in a vector field, we worked out a mathematical method of searching for 3D null-points in coronal magnetic fields. After introducing the relevant differential topology, we test the method by using the analytical model of Brown & Priest. The location of null-point identified by our method coincides precisely with the analytical solution. Finally we apply the method to the 3D coronal magnetic fields reconstructed from an observed MDI magnetogram of a super-active region (NOAA 10488). We find that the 3D null-point seems to be a key element in the magnetic topology associated with flare occurrence.
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| 关 键 词： | 太阳物理学 太阳光谱 太阳耀斑 太阳活动 磁场 |
A New Method of Identifying 3D Null Points in Solar Vector Magnetic Fields |
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| Hui Zhao,Jing-Xiu Wang,Jun Zhang and Chi-Jie Xiao National Astronomical Observatories,Chinese Academy of Sciences,Beijing .A New Method of Identifying 3D Null Points in Solar Vector Magnetic Fields[J].Chinese Journal of Astronomy and Astrophysics,2005,5(5):443-447. |
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| Authors: | Hui Zhao Jing-Xiu Wang Jun Zhang Chi-Jie Xiao |
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| Institution: | National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 |
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| Abstract: | Employing the Poincare index of isolated null-points in a vector field, we worked out a mathematical method of searching for 3D null-points in coronal magnetic fields. After introducing the relevant differential topology, we test the method by using the analytical model of Brown & Priest. The location of null-point identified by our method coincides precisely with the analytical solution. Finally we apply the method to the 3D coronal magnetic fields reconstructed from an observed MDI magnetogram of a super-active region (NOAA 10488). We find that the 3D null-point seems to be a key element in the magnetic topology associated with flare occurrence. |
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| Keywords: | Sun: flares - Sun: corona - Sun: magnetic fields |
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