Observation of high-energy diffuse gamma-radiation by the Cosmos-856 and Cosmos-914 satellites

Cosmos 856 and 914 measurements of diffuse gamma-radiation with energy exceeding 100 MeV are examined. Absolute flux densities of gamma rays with energies of 100-200 MeV at low, middle, and high galactic latitudes are analyzed along with the gamma-ray spectrum in the near-equatorial galactic region, (b II) not greater than 30 deg; and these results are shown to agree with SAS-2 and COS-B observations. In addition, observations were made of the energy spectrum of gamma rays in the 100-4000 MeV range, recorded at galactic latitudes where (b II) is greater than 30 deg. The spectrum form of the isotropic gamma-ray component isolated from the complete diffuse gamma flux in this region indicates that an isotropic gamma background may be generated directly in forbidden metagalactic sources.