MG I as a probe of the solar chromosphere - The atomic model

Abstract

We present a complete atomic model for Mg i line synthesis, where all the atomic parameters are based on recent experimental and theoretical data. We study how the computed profiles at 4571 Â and 5173 Â are influenced by the choice of these parameters and the number of levels included in the model atom. We also present observed profiles of the A5173 Â b 2 line and theoretical profiles for comparison based on a recent atmospheric model for the average quiet Sun.