On the center to limb variation of the separation of the Mg ii,H2 and K2 emission peaks

From observations of the center to limb variation of the emission peaks of the Mgii, H and K lines the optical thickness of the emitting layer for a simplified geometrical model has been calculated to be 300. The source function was approximated by a second order polynomial. The turbulent velocities of the emitting layer are found to be 6.8 km/sec, in agreement with other observations.