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

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..747j&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, Apr. 15, 1979, p. 747-752.

Astronomy and Astrophysics

Astrophysics

57

Cosmic Rays, Halos, Milky Way Galaxy, Convection, Diffusion Coefficient, Dynamic Models, Leakage

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 about 1 GeV per 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 per nucleon is seen to mark a transition to a convection-dominated regime where the diffusion coefficient is no longer the determining parameter. A fit to the observations yields a halo outflow velocity of 8 km/s. 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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