Improved magnetogram calibration of Solar Magnetic Field Telescope and its comparison with the Helioseismic and Magnetic Imager

	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.
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2014
卷号	445 期号:1 页码:49-55
关键词	line: profiles polarization radiative transfer sunspots
ISSN号	0035-8711
通讯作者	Bai, XY (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, 20 Datun Rd, Beijing 100012, Peoples R China.
英文摘要	In 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.
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/4434]
专题	国家空间科学中心_空间科学部
推荐引用方式 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.,&Wang, G. P..(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.