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Propagation Cosmic ray propagation encompasses the changes induced in the cosmic ray "beam" during confinement in the galaxy (or other regions). These changes are of two types. First, the composition of the GCR is modified due to nuclear interactions in the ISM which fragments heavy nuclei into lighter species and creates secondary particles such as positrons and anti-protons. 7 K radiation) and, possibly, energy gain due to stochastic acceleration or to passage through interstellar shocks. ) Propagation, therefore, connects the GCR source/acceleration regions to the energy spectrum and composition that exists in local interstellar space (LIS), just beyond our solar cavity.

Silberberg and C. H. C. 20375 J. R. Letaw, Severn Communications Corporation, Severna Park, MD 21146 M. M. , nuclei that are neutral near 10K, due to high first ionization potentials, are reduced in abundance by a factor of about 6. Such temper atures (with correspond ing energ ies of about 1 e V) are characteristic of stellar photospheres. A similar selection effect (related to migration of particles from the solar photosphere or chromosphere into the corona) affects the composition of the corona, the solar wind and solar flare particles.

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