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A nonlinear solar magnetic field calibration method for the filter-based magnetograph by the residual network
Guo, Jingjing1,4; Bai, Xianyong1,4; Liu, Hui2; Yang, Xu3; Deng, Yuanyong1,4; Lin, Jiaben1; Su, Jiangtao1,4; Yang, Xiao1; Ji, Kaifan2
2021-02-04
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume646Pages:12
AbstractContext. The method of solar magnetic field calibration for the filter-based magnetograph is normally the linear calibration method under weak-field approximation that cannot generate the strong magnetic field region well due to the magnetic saturation effect.Aims. We try to provide a new method to carry out the nonlinear magnetic calibration with the help of neural networks to obtain more accurate magnetic fields.Methods. We employed the data from Hinode/SP to construct a training, validation and test dataset. The narrow-band Stokes I, Q, U, and V maps at one wavelength point were selected from all the 112 wavelength points observed by SP so as to simulate the single-wavelength observations of the filter-based magnetograph. We used the residual network to model the nonlinear relationship between the Stokes maps and the vector magnetic fields.Results. After an extensive performance analysis, it is found that the trained models could infer the longitudinal magnetic flux density, the transverse magnetic flux density, and the azimuth angle from the narrow-band Stokes maps with a precision comparable to the inversion results using 112 wavelength points. Moreover, the maps that were produced are much cleaner than the inversion results. The method can effectively overcome the magnetic saturation effect and infer the strong magnetic region much better than the linear calibration method. The residual errors of test samples to standard data are mostly about 50 G for both the longitudinal and transverse magnetic flux density. The values are about 100 G with our previous method of multilayer perceptron, indicating that the new method is more accurate in magnetic calibration.
Keywordmagnetic fields Sun: magnetic fields
Funding OrganizationChinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Beijing Municipal Science and Technology ; Beijing Municipal Science and Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Beijing Municipal Science and Technology ; Beijing Municipal Science and Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Beijing Municipal Science and Technology ; Beijing Municipal Science and Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Beijing Municipal Science and Technology ; Beijing Municipal Science and Technology
DOI10.1051/0004-6361/202038617
WOS KeywordFARADAY-ROTATION ; INVERSION ; TELESCOPE
Language英语
Funding ProjectChinese Academy of Sciences[XDA15320300] ; Chinese Academy of Sciences[XDA15320302] ; Chinese Academy of Sciences[XDA15052200] ; Chinese Academy of Sciences[XDA15010800] ; National Natural Science Foundation of China (NSFC)[12073077] ; National Natural Science Foundation of China (NSFC)[11873027] ; National Natural Science Foundation of China (NSFC)[11773072] ; National Natural Science Foundation of China (NSFC)[11427803] ; National Natural Science Foundation of China (NSFC)[11427901] ; National Natural Science Foundation of China (NSFC)[11773040] ; National Natural Science Foundation of China (NSFC)[11573012] ; National Natural Science Foundation of China (NSFC)[11833010] ; National Natural Science Foundation of China (NSFC)[11973056] ; National Natural Science Foundation of China (NSFC)[11873062] ; National Natural Science Foundation of China (NSFC)[11773038] ; National Natural Science Foundation of China (NSFC)[11703042] ; Beijing Municipal Science and Technology[Z181100002918004]
Funding OrganizationChinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Beijing Municipal Science and Technology ; Beijing Municipal Science and Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Beijing Municipal Science and Technology ; Beijing Municipal Science and Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Beijing Municipal Science and Technology ; Beijing Municipal Science and Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Beijing Municipal Science and Technology ; Beijing Municipal Science and Technology
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000617329100003
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79239
Collection中国科学院国家天文台
Corresponding AuthorGuo, Jingjing
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China
3.Big Bear Solar Observ, 40386 North Shore Lane, Big Bear City, CA 92314 USA
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Guo, Jingjing,Bai, Xianyong,Liu, Hui,et al. A nonlinear solar magnetic field calibration method for the filter-based magnetograph by the residual network[J]. ASTRONOMY & ASTROPHYSICS,2021,646:12.
APA Guo, Jingjing.,Bai, Xianyong.,Liu, Hui.,Yang, Xu.,Deng, Yuanyong.,...&Ji, Kaifan.(2021).A nonlinear solar magnetic field calibration method for the filter-based magnetograph by the residual network.ASTRONOMY & ASTROPHYSICS,646,12.
MLA Guo, Jingjing,et al."A nonlinear solar magnetic field calibration method for the filter-based magnetograph by the residual network".ASTRONOMY & ASTROPHYSICS 646(2021):12.
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