Preprocessing the Photospheric Vector Magnetograms for an NLFFF Extrapolation Using a Potential-Field Model and an Optimization Method
文献类型：期刊论文
| 作者 | Jiang, Chaowei; Feng, Xueshang |
| 刊名 | SOLAR PHYSICS
 |
| 出版日期 | 2014 |
| 卷号 | 289期号:1页码:63-77 |
| ISSN号 | 0038-0938 |
| 关键词 | Magnetic fields Magnetic fields Nonlinear force-free field (NLFFF) Preprocessing corona photosphere |
| 通讯作者 | Jiang, CW (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, SIGMA Weather Grp, State Key Lab Space Weather, Beijing 100190, Peoples R China. |
| 英文摘要 | Numerical reconstruction/extrapolation of the coronal nonlinear force-free magnetic field (NLFFF) usually takes the photospheric vector magnetogram as input at the bottom boundary. The magnetic field observed at the photosphere, however, contains a force that is in conflict with the fundamental assumption of the force-free model. It also contains measurement noise, which hinders the practical computation. Wiegelmann, Inhester, and Sakurai (Solar Phys. 233, 215, 2006) have proposed to preprocess the raw magnetogram to remove the force and noise to provide better input for NLFFF modeling. In this paper we develop a new code of magnetogram preprocessing that is consistent with our extrapolation method CESE-MHD-NLFFF (Jiang, Feng, and Xiang in Astrophys. J. 755, 62, 2012; Jiang and Feng in Astrophys. J. 749, 135, 2012a). Based on the magnetic-splitting rule that a magnetic field can be split into a potential-field part and a non-potential part, we split the magnetogram and dealt with the two parts separately. The preprocessing of the magnetogram's potential part is based on a numerical potential-field model, and the non-potential part is preprocessed using the similar optimization method of Wiegelmann, Inhester, and Sakurai (2006). The code was applied to the SDO/HMI data, and results show that the method can remove the force and noise efficiently and improve the extrapolation quality. |
| 学科主题 | 空间物理 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.cssar.ac.cn/handle/122/1505]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Jiang, Chaowei,Feng, Xueshang. Preprocessing the Photospheric Vector Magnetograms for an NLFFF Extrapolation Using a Potential-Field Model and an Optimization Method[J]. SOLAR PHYSICS,2014,289(1):63-77. |
| APA | Jiang, Chaowei,&Feng, Xueshang.(2014).Preprocessing the Photospheric Vector Magnetograms for an NLFFF Extrapolation Using a Potential-Field Model and an Optimization Method.SOLAR PHYSICS,289(1),63-77. |
| MLA | Jiang, Chaowei,et al."Preprocessing the Photospheric Vector Magnetograms for an NLFFF Extrapolation Using a Potential-Field Model and an Optimization Method".SOLAR PHYSICS 289.1(2014):63-77. |
入库方式： OAI收割
来源：国家空间科学中心
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