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Preprocessing the Photospheric Vector Magnetograms for an NLFFF Extrapolation Using a Potential-Field Model and an Optimization Method
Jiang, Chaowei; Feng, Xueshang; 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.
Department空间科学部
Source PublicationSOLAR PHYSICS
2014
Volume289Issue:1Pages:63-77
ISSN0038-0938
Language英语
KeywordMagnetic Fields Nonlinear Force-free Field (Nlfff) Corona Magnetic Fields Preprocessing Photosphere
AbstractNumerical 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.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1505
Collection空间科学部
Corresponding AuthorJiang, CW (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, SIGMA Weather Grp, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Jiang, Chaowei,Feng, Xueshang,Jiang, CW . 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,&Jiang, CW .(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.
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