Semiempirical models of chromospheric flare regions
Abstract
Homogeneous plane-parallel semiempirical flare model atmospheres which reproduce observations in lines and continua of H I, Si I, C I, Ca II, and Mg II have a thin transition zone at the top of the enhanced chromosphere, indicating a significant amount of heating from the zone to the temperature minimum level. The minimum temperature is located deeper and is higher than in the quiet-sun and active-region models. The results do not agree with the particle-heated theoretical models, and it is suggested that the models of Brown (1973) and Henoux and Nakagawa (1977, 1978) do not include an essential term for heat conduction in their energy balance equations. It is concluded that substantial Ly-alpha radiative heating occurs in the upper chromosphere resulting from the conductive energy flux in the transition zone where the Ly-alpha line cools the gas.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1980
- DOI:
- 10.1086/158467
- Bibcode:
- 1980ApJ...242..336M
- Keywords:
-
- Atmospheric Models;
- Chromosphere;
- Radiative Heat Transfer;
- Solar Atmosphere;
- Solar Flares;
- Brightness Temperature;
- H Lines;
- Solar Spectra;
- Solar Temperature;
- Solar Physics