Multi-Component Models for the Formation of the Chromospheric Ca II K Line. II: The Effect of Velocity Fields
Abstract
Recent high resolution observations of the Ca II fine structure are discussed. An analytic method is applied to examine the effects of velocity fields on multi-component model atmospheres in which the central reversal in the bright components is due to self-absorption. It is shown that the inclusion of quite reasonable velocity fields permits the reproduction of not only the high resolution profiles of the small scale emission features but also the qualitative centre-limb behaviour of the spatially averaged profiles. The method is also used to examine models suggested by Pasachoff and others in which the double reversal is a statistical effect of singly peaked velocity shifted profiles. These models are shown to encounter severe difficulties near the limb.
- Publication:
-
Solar Physics
- Pub Date:
- February 1972
- DOI:
- 10.1007/BF00148703
- Bibcode:
- 1972SoPh...22..375C
- Keywords:
-
- Atmosphere;
- High Resolution;
- Velocity Field;
- Fine Structure;
- Peaked Velocity