Partially coherent scattering models for the formation of the chromospheric Ca ii K line
Abstract
We discuss a model for the formation of the chromospheric Ca II K line which does not make the usual assumption of complete redistribution. Using a physically reasonable scattering model, we find significant departures due to the frequency dependence of the line source function, particularly in the relative intensity and centre-to-limb behaviour of the K1 parts of the line and in the asymmetry produced by differential velocity fields. We conclude that the frequency dependence of the K line source function must be considered in quantitative models for the formation of the K line.
- Publication:
-
Solar Physics
- Pub Date:
- October 1974
- DOI:
- 10.1007/BF00155074
- Bibcode:
- 1974SoPh...38..367V
- Keywords:
-
- Atmospheric Models;
- Chromosphere;
- Coherent Scattering;
- K Lines;
- Solar Spectra;
- Astronomical Models;
- Calcium;
- Radiant Flux Density;
- Solar Atmosphere;
- Solar Limb;
- Velocity Distribution;
- Solar Physics;
- Velocity Field;
- Relative Intensity;
- Frequency Dependence;
- Quantitative Model;
- Line Source