The interpretation of absorption-line shifts in the solar spectrum

Abstract

The shifts of Fraunhofer lines of different chemical elements in a homogeneous medium with a plane monochromatic progressive adiabatic sound waves are derived. The calculations indicate that lines of neutral elements (6 ~< ;go ~< 14) with lower excitation potentials Zo~ = 0-2 eV are red shifted, those with excitation potential Z0.z = 4-12 eV are blue shifted, and with Z0~ = 3 eV are both blue and red shifted. The lines of ions are shifted toward the blue. The shifts of Fraunhofer lines are found to decrease from the centre of the solar disk to the limb. These results agree qualitatively and quantitatively with observations.

On the asymmetry of selected fraunhofer lines, II

“…We obtained asymmetry not for averaged line profiles as in the previous paper (Kostik and Orlova, 1970) but for each of individual scans. The mean values of asymmetry for observed profiles A1 and corrected ones for instrumental profile z] 2 are given in the sixth and seventh columns of Table I.…”

“…The expression for the profile of absorption coefficient in a medium with progressive sound wave was found by Eriksen and Maltby (1967), Kostik and Orlova (1972). However, the relaxation processes were not taken into account.…”

“…The procedure of photoelectric observations and reduction has been described in detail earlier (Kostik and Orlova, 1970). The description of the telescope and its characteristics was given by Gurtovenko (1969a, b).…”