The structure of the temperature minimum region in solar flares and its significance for flare heating mechanisms.
Abstract
We analyze Ca II K-line profiles of one flare and EUV continuum observations of two other flares in order to infer values for the temperature enhancements (over active region values) produced in the upper photosphere around and above the temperature minimum region. The results, obtained through a partial redistribution calculation of the Ca II K-line profiles and an LTE approach to the continuum observations, show that the flare temperature minimum is depressed some two scale heights below its preflare level, and that substantial temperature enhancements are produced even at this depth. Estimates for the energy release in these photospheric layers are given, and are found to be comparable with that released in chromospheric Hα and Lα emission.
- Publication:
-
Solar Physics
- Pub Date:
- July 1978
- DOI:
- 10.1007/BF00157282
- Bibcode:
- 1978SoPh...58..363M
- Keywords:
-
- Calcium;
- Far Ultraviolet Radiation;
- Photosphere;
- Radiant Heating;
- Solar Flares;
- Solar Temperature;
- Atmospheric Heating;
- Energy Spectra;
- K Lines;
- Line Shape;
- Metal Ions;
- Solar Atmosphere;
- Solar Heating;
- Solar Physics;
- Ultraviolet Spectra;
- Solar Physics;
- Flare;
- Temperature Minimum;
- Proton Beam;
- Solar Flare;
- Scale Height;
- Solar Flares:Heating;
- Solar Flares:Temperatures