Comprehensive Dual-Species Observations of the Long Duration Gamma Ray Flares of 1991 June 9 and 11.

We have re-examined the comprehensive CGRO observations of two key Long Duration Gamma Ray Flares, those being 1991 June 9 and 11. These events are unique because they cover a wide range of gamma-ray energies from 50 keV to above 1 GeV. Most importantly, neutrons were spectroscopically analyzed from these events. The MeV and GeV emissions (neutron and gamma) from both flares last for extended periods of time on the order of one hour, the GeV gamma emission being most visible tor many hours. The broad band emission profiles we present conform in toto to a picture of proton acceleration, transport and precipitation within a large coronal loop. Given the difficulties inherent in robustly explaining proton precipitation from a CME shock great distances from the Sun (Hutchinson et al., this meeting), we turn our attention to quantitatively modeling how the phenomenon occurs in this static or quasi-static magnetic environment. Other signatures in the high energy data are reviewed that support this overarching conclusion. It points to the importance of simultaneous broad band measurements of gamma rays and neutrons from 1 MeV to above 1 GeV, an overlooked hallmark of the Compton Observatory mission.