Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82..110f&link_type=abstract
Astronomy and Astrophysics, vol. 82, no. 1-2, Feb. 1980, p. 110-122.
Astronomy and Astrophysics
Astrophysics
22
Astronomical Models, Beryllium 10, Cosmic Rays, Galactic Radiation, Milky Way Galaxy, Radiation Distribution, Chronology, Convection, Diffusion Coefficient, Halos
Scientific paper
A model of cosmic ray propagation in the Galaxy is considered in which the sources are uniformly distributed in the disk. The cosmic rays diffuse into a halo where diffusion is combined with outward convection. The propagation equation has been solved analytically to give the distributions of total age and disk-age, and the surviving fraction of radioactive 10Be, ƒs, in terms of 4 propagation parameters. A knowledge of the grammage, X, traversed by cosmic rays and of ƒs sets lower limits, but no upper limits, to the mean age of cosmic rays at the earth and the extent of the halo. Provided that ƒs ≲ 1/3 an upper limit of ∼16 km s-1 to the outward convection velocity in the halo is set by the value of X.
Freedman Ian
Giler M.
Kearsey S.
Osborne John L.
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