A fast Stokes inversion technique based on quadratic regression  

作　　者：Fei Teng Yuan-Yong Deng 

机构地区：[1]Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2016年第5期7-16,共10页天文和天体物理学研究（英文版）

基　　金：funded by the Key Laboratory of Solar Activity of Chinese Academy of Sciences and the National Science Foundation;supported by the National Natural Science Foundation of China (Grant Nos. 11178005 and 11427901);the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB09040200)

摘　　要：Stokes inversion calculation is a key process in resolving polarization information on radiation from the Sun and obtaining the associated vector magnetic fields. Even in the cases of simple local thermo- dynamic equilibrium （LTE） and where the Milne-Eddington approximation is valid, the inversion problem may not be easy to solve. The initial values for the iterations are important in handling the case with mul- tiple minima. In this paper, we develop a fast inversion technique without iterations. The time taken for computation is only 1/100 the time that the iterative algorithm takes. In addition, it can provide available initial values even in cases with lower spectral resolutions. This strategy is useful for a filter-type Stokes spectrograph, such as SDO/HMI and the developed two-dimensional real-time spectrograph （2DS）.Stokes inversion calculation is a key process in resolving polarization information on radiation from the Sun and obtaining the associated vector magnetic fields. Even in the cases of simple local thermo- dynamic equilibrium （LTE） and where the Milne-Eddington approximation is valid, the inversion problem may not be easy to solve. The initial values for the iterations are important in handling the case with mul- tiple minima. In this paper, we develop a fast inversion technique without iterations. The time taken for computation is only 1/100 the time that the iterative algorithm takes. In addition, it can provide available initial values even in cases with lower spectral resolutions. This strategy is useful for a filter-type Stokes spectrograph, such as SDO/HMI and the developed two-dimensional real-time spectrograph （2DS）.

关 键 词：Sun： magnetic fields -- methods： statistical -- methods： data analysis -- techniques： polari-metric 

分 类 号：P182[天文地球—天文学]