An empirical, statistical model for the formation of the cores of chromospheric Fraunhofer lines.
Abstract
We describe an empirical, statistical model for the formation of the cores of chromospheric Fraunhofer lines. The model chromosphere consists of brighter structural elements with large scale motions randomly distributed in space, and above these, darker structural elements, again randomly distributed in space. Both components overlie a more uniform lower chromosphere. The probability of finding a given number of elements along a line of sight is specified by a Poisson distribution, in terms of the average number of structures along the line of sight. When this average is small, the statistical model may behave like an effectively thin plane-parallel chromosphere, even when the optical thickness of the individual structures is very large.
- Publication:
-
Solar Physics
- Pub Date:
- September 1977
- DOI:
- 10.1007/BF00146419
- Bibcode:
- 1977SoPh...54....3S
- Keywords:
-
- Chromosphere;
- Fraunhofer Lines;
- Mathematical Models;
- Stellar Models;
- Poisson Density Functions;
- Solar Spectra;
- Solar Physics;
- Statistical Model;
- Poisson Distribution;
- Line Centre;
- Optical Thickness;
- Resonance Line;
- Fraunhofer Lines:Solar Chromosphere;
- Line Profiles:Solar Chromosphere