Abstract
Gamma-ray spectra of the inner and outer Galaxy, derived from COS-B satellite observations of the diffuse Galactic gamma-ray emission at energies between 50 MeV and 5 GeV, are presented and analyzed. The analysis reveals that the outer proton spectrum is flatter than the inner spectrum; and it is estimated that a few GeV protons have radial scale lengths of 10-15 kpc, and that the distribution flattens with increasing energy. This relation between energy and the mean CR path length is studied in terms of CR diffusion, convection, and Fermi reacceleration throughout the Galaxy. 32 references.
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