Some issues in diagnostics of solar chromospheric magnetic fields with the Mg b2 line |
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Authors: | Xian-Yong Bai Yuan-Yong Deng Jiang-Tao Su Guo-Ping Wang |
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Institution: | [1]Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China [2]University of Chinese Academy of Sciences, Beijing 100049, China [3]State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract: | Up to now,exact measurements of chromospheric magnetic fields have not been as successful as those done in the photosphere.We are currently engaging in diagnostics of chromospheric magnetic fields with the Mg b2line by employing the Multi-Channel Solar Telescope at Huairou Solar Observing Station.Therefore,how to improve accuracy in the measurement is the main issue of our present study.To this end,we first study linear calibration coefficients for longitudinal and transverse components of chromospheric fields,which vary with wavelength,in the case of a weak field assumption.Then the polarization crosstalk introduced by instruments is analyzed in detail with two numerical simulation methods.Comparisons of the polarization signals between cases with and without correction are presented.The result indicates that polarization accuracy is greatly improved after crosstalk correction. |
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Keywords: | Sun: chromospheric -- magnetic fields -- spectral profiles: radiative transfer |
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