Structure of a simple sunspot from the inversion of IR spectral data

Analysis of spectral data of two neighboring infrared lines, Fe I 15648.5 Å ( g = 3) and FeI 15652.9 Å ( g eff = 1.53) are carried out for a simple sunspot when it was near the solar disk center ( μ = 0.92), to understand the basic structure of sunspot magnetic field. Inversions of Stokes profiles are carried out to derive different atmospheric parameters both as a function of location within the sunspot and height in the atmosphere. As a result of the inversion we have obtained maps of magnetic field strength, temperature, line‐of‐sight velocity, field inclination and azimuth for different optical depth layers between log( τ 5 ) = 0 and log( τ 5 ) = –2.0. In this paper we present few results from our inversion for a layer averaged between log( τ 5 ) from 0.0 to –0.5.