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Variations of the λ525.02 nm FeI line profile over the solar disk and observations of large-scale magnetic fields

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Abstract

This paper examines the question of the influence of the λ525.02 nm Fei line profile (slope of its wings) variations over the solar disk upon observations of large-scale magnetic fields (LSMF) made in this line. The study has shown that depending on the position on the disk (‘center-limb’ effect) and magnetic field parameters at the place of the observation, values of magnetic field strengths determined with proper account of the real line profile and in the usual way (by calibration using the line profile at the center of the solar disk only) can differ by 25% or more, which is of crucial importance. Observations at the Solar Telescope for Operative Predictions (STOP) of the Sayan Observatory have been used to accomplish this work.

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  1. Institute of Solar-Terrestrial Physics at the Siberian Branch of the Russian Academy of Sciences (ISTP SB RAS), P.O. Box 4026, 66403, Irkutsk, Russia

    M. L. Demidov

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Demidov, M.L. Variations of the λ525.02 nm FeI line profile over the solar disk and observations of large-scale magnetic fields. Sol Phys 153, 115–129 (1994). https://doi.org/10.1007/BF00712495

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  • DOI: https://doi.org/10.1007/BF00712495

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