COMPARISON OF SPECTRAL MEASUREMENTS OF MAGNETIC FIELDS IN A SUNSPOT USING LINES WITH DIFFERENT LANDE FACTORS

We analyze the spectral observations of a sunspot in six metal lines near Fe I 5434.5 angstrom, which have effective Lande factors g(eff) from -0.014 to 2.14. The observations were made on August 25, 2015 on the ATsU-5 telescope of GAO NAS of Ukraine, using a circular polarization analyzer and spectra registration with the SBIG ST-8300 CCD camera. The following line parameters are compared: the observed splitting of I +/- V profiles, the width and depth of the Stokes I profiles. Significant differences of the measured magnetic field strengths Bobs were found in separate places of the spot and by lines with different g(eff) values. The Fe I 5434.5 angstrom line (g(eff) = -0.014) shows a measurable splitting in some locations of the sunspot, which corresponds to the magnetic field B-obs approximate to 20 kG. Comparison of the widths and depths of the line profiles revealed two special places in the sunspot, where the Fe I 5434.5 angstrom line was expanded additionally by approximate to 15 - 35%, whereas other lines with larger Lande factors did not have such a feature. One of the reasons for this expansion could be a sharp and local increase of turbulent velocities, but no active processes such as solar flares or significant Doppler flows were observed at this location. Another reason for this expansion may be the presence of extremely strong and spatially unresolved magnetic fields of mixed magnetic polarity.