Abundance study of the 4 June 1991 solar flare using CGRO/OSSE spectral data
Abstract
Spectral observations of the 4 June 1991 solar flare obtained with the Oriented Scintillation Spectrometer Experiment (OSSE) on board the Compton Gamma Ray Observatory (CGRO) are used to determine the interaction rate of the accelerated protons by fitting two-minute spectra with a narrow nuclear-deexcitation line template. The lines are produced primarily when accelerated protons interact with ambient solar material and thus reveal the proton interaction rate. The OSSE observations provide the only direct measurements of this emission during the intense portion of the 4 June flare. A subset of the data is then used to determine individual fluxes of 8 narrow γ-ray lines. These preliminary fluxes are compared to line fluxes determined for 19 flares obtained with the Solar Maximum Mission Gamma Ray Spectrometer (SMM/GRS). Ambient elements with low first-ionization potentials (FIP) appear to be enhanced relative to those with higher FIP (as compared to the photosphere) similar to the enhancement found previously for the 27 April 1981 SMM flare.
- Publication:
-
High energy solar Physics
- Pub Date:
- June 1996
- DOI:
- 10.1063/1.50954
- Bibcode:
- 1996AIPC..374..184M
- Keywords:
-
- 96.60.Tf;
- 26.45.+h;
- Solar electromagnetic emission