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Improved magnetogram calibration of Solar Magnetic Field Telescope and its comparison with the Helioseismic and Magnetic Imager
Bai, X. Y.; Deng, Y. Y.; Teng, F.; Su, J. T.; Mao, X. J.; Wang, G. P.; Bai, XY (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, 20 Datun Rd, Beijing 100012, Peoples R China.
Department空间科学部
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2014
Volume445Issue:1Pages:49-55
ISSN0035-8711
Language英语
KeywordLine: Profiles Polarization Radiative Transfer Sunspots
AbstractIn this paper, we try to improve the magnetogram calibration method of the Solar Magnetic Field Telescope (SMFT). The improved calibration process fits the observed full Stokes information, using six points on the profile of Fe I 5324. 18 angstrom line, and the analytical Stokes profiles under the Milne-Eddington atmosphere model, adopting the Levenberg-Marquardt least-squares fitting algorithm. In comparison with the linear calibration methods, which employs one point, there is a large difference in the strength of longitudinal field B-l and transverse field B-t, caused by the non-linear relationship, but the discrepancy is little in the case of inclination and azimuth. We conclude that it is better to deal with the non-linear effects in the calibration of B-l and B-t using six points. Moreover, in comparison with Solar Dynamics Observatory/Helioseismic and Magnetic Imager (HMI), SMFT has larger stray light and acquires less magnetic field strength. For vector magnetic fields in two sunspot regions, the magnetic field strength, inclination and azimuth angles between SMFT and HMI are roughly in agreement, with the linear fitted slopes of 0.73/0.7, 0.95/1.04 and 0.99/1.1. In the case of pores and quiet regions (B-l < 600 G), the fitted slopes of the longitudinal magnetic field strength are 0.78 and 0.87, respectively.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/4434
Collection空间科学部
Corresponding AuthorBai, XY (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, 20 Datun Rd, Beijing 100012, Peoples R China.
Recommended Citation
GB/T 7714
Bai, X. Y.,Deng, Y. Y.,Teng, F.,et al. Improved magnetogram calibration of Solar Magnetic Field Telescope and its comparison with the Helioseismic and Magnetic Imager[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,445(1):49-55.
APA Bai, X. Y..,Deng, Y. Y..,Teng, F..,Su, J. T..,Mao, X. J..,...&Bai, XY .(2014).Improved magnetogram calibration of Solar Magnetic Field Telescope and its comparison with the Helioseismic and Magnetic Imager.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,445(1),49-55.
MLA Bai, X. Y.,et al."Improved magnetogram calibration of Solar Magnetic Field Telescope and its comparison with the Helioseismic and Magnetic Imager".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 445.1(2014):49-55.
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