Temporal and spectral characteristics of the June 11, 1991 gamma-ray flare
Abstract
The June 11, 1991 event is one of the major flares produced by AR6659 during its transit on the solar disk. In addition to bremsstrahlung emission this flare exhibits strong nuclear gamma-ray lines. We report here PHEBUS observations of this flare and perform a detailed comparison of the time histories of both the prompt (4-7 MeV) and delayed 2.23 MeV GRL emissions. We derive for this flare preliminary values of the He-3/H-1 ratio and the hardness of the ion spectrum and compare these values with the ones obtained from previous observations.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- January 1993
- Bibcode:
- 1993A&AS...97..337T
- Keywords:
-
- Gamma Ray Spectra;
- Solar Flares;
- Solar Spectra;
- Abundance;
- Emission Spectra;
- Helium;
- Hydrogen;
- Solar Physics