Chromospheric downflows as a diagnostic of solar flare heating.
Abstract
Using coordinated X-ray and Hα observations of five solar flares, the authors investigate the dynamics of chromospheric condensations formed during chromospheric evaporation. They show that the peak downflow velocity of condensations predicted by simple hydrodynamic compression of the chromosphere is in good agreement with empirical downflow velocities implied by impulsive phase Hα redwing Doppler shifts. This agreement indicates that the Hα wing redshift provides a useful diagnostic of the pressure excess in the evaporating region and, hence, the energy flux driving chromospheric evaporation.
- Publication:
-
Solar and Stellar Flares. Poster Papers
- Pub Date:
- 1989
- Bibcode:
- 1989sasf.confP.203Z
- Keywords:
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- Solar Chromosphere: Dynamics;
- Solar Flares: Heating;
- Solar Flares: X Rays