The dynamical halo and the variation of cosmic-ray path length with energy

Details The dynamical halo and the variation of cosmic-ray path length with energy The dynamical halo and the variation of cosmic-ray path length with energy

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7834027j&link_type=abstract

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Physics

Cosmic Rays, Diffusion Coefficient, Galactic Structure, Halos, Paths, Energy Dissipation, Interstellar Matter, Milky Way Galaxy, Radioactive Decay

Scientific paper

It is shown that the dynamical halo model offers a natural explanation for the form of the variation of the cosmic-ray path length with energy. The variation above approximately 1 GeV/nucleon can be understood as due to the variation of the diffusion coefficient, and hence the resident time, with energy. The flattening of the curve below 1 GeV/nucleon is seen to mark a transition to a convection dominated regime where coefficient is no longer the determining parameter. A fit to the observations yields a halo outflow velocity of 8 km sec/1. An attempt is made to determine the overall scale of the halo and the diffusion coefficient using recent Be-10 flux measurements but the data do not agree well enough to pin down these variables to within less than four or five orders of magnitude.

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