EMPIRICAL INVESTIGATION OF SOLAR PHOTOSPHERE AND FACULAE IN Ca II IR TRIPLET LINES USING NON-LOCAL THERMODYNAMIC EQUILIBRIUM METHOD

The observed emergent intensities at different displacements from the centres of infrared Ca II triplet line profiles (lambda 8498.024 angstrom, lambda 8542.091 angstrom and lambda 8662.141 angstrom) are used to determine the depth-variations of the lines and local continuum source functions in solar photosphere and faculae. Analytical studies of data used are carried out without using local thermodynamic equilibrium (LTE) assumption, and without applying pre-assigned models of the solar photosphere and faculae. The determined distributions of electronic and excitation temperatures at effective depths of formations of photospheric and facular Ca II infrared triplet lines are nearly in agreement with the published values.