EGRET Analysis of the Solar Nuclear Line Flares of June , 1991

Details EGRET Analysis of the Solar Nuclear Line Flares of June , 1991 EGRET Analysis of the Solar Nuclear Line Flares of June , 1991

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.6804s&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #68.04; Bulletin of the American Astronomical Society, Vol. 25, p.1396

Astronomy and Astrophysics

Astronomy

Scientific paper

During June 1991 , the Energetic Gamma Ray Experiment Telescope on the Compton Observatory observed the four energetic flares occuring on June 4,6,9 and 11 from the active solar region 6659. Spectral and temporal data were obtained with EGRET's large NaI detector and imaging spark chamber . The June 11 flare was observed to have gamma-rays exceeding 1 GeV and last for hours after the impulsive phase. The NaI spectra have been fit with a power law spectrum, a neutron capture spectrum and a solar excitation spectrum . From these fits , the fluences of the 2.223 MeV neutron capture line and the 4.43 Mev carbon excitation line have been estimated for each flare. An additional spectral component corresponding to neutron induced activity in the Compton Observatory is required for the intense flares of June 4 and June 6. This component provides an indication of the arrival times of solar neutrons at the Observatory.

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