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A fast Stokes inversion technique based on quadratic regression

A fast Stokes inversion technique based on quadratic regression
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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).
出处 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 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)
关键词 Sun: magnetic fields -- methods: statistical -- methods: data analysis -- techniques: polari-metric Sun: magnetic fields -- methods: statistical -- methods: data analysis -- techniques: polari-metric
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