H alpha Spectra of Dynamic Chromospheric Processes in Five Well-observed X-Ray Flares
Abstract
Simultaneous H-alpha and hard X-ray (HXR) spectra were obtained for five solar flares to determine the relationship of H-alpha profiles and the nonthermal part of the flare represented by the hard X-ray burst. All five flares exhibited impulsive-phase redshifted H-alpha in emission, which was temporarily and spatially associated with intense HXR emission and broad impulsive-phase H-alpha wings. A few small regions within two flares showed a blueshifted H-alpha emission which appeared only early in the impulsive phase and was temporally correlated with the HXR emission but not with broad H-alpha wings. Finally, there were both redshifted and blueshifted absorption spectra with properties fully consistent with those known for erupting and untwisting filaments.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1990
- DOI:
- 10.1086/169345
- Bibcode:
- 1990ApJ...363..318C
- Keywords:
-
- Chromosphere;
- H Alpha Line;
- Solar Flares;
- Solar X-Rays;
- Absorption Spectra;
- Emission Spectra;
- Line Spectra;
- Red Shift;
- Solar Magnetic Field;
- Solar Spectra;
- Solar Physics;
- SUN: CHROMOSPHERE;
- SUN: FLARES;
- SUN: X-RAYS