Galactic diffusion and wind models of cosmic-ray transport. I - Insight from CR composition studies and gamma-ray observations

Details Galactic diffusion and wind models of cosmic-ray transport. I - Insight from CR composition studies and gamma-ray observations Galactic diffusion and wind models of cosmic-ray transport. I - Insight from CR composition studies and gamma-ray observations

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..372b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 2, p. 372-387.

Astronomy and Astrophysics

Astrophysics

46

Convection, Diffusion, Galactic Cosmic Rays, Interstellar Matter, Charged Particles, Mathematical Models, Particle Interactions

Scientific paper

The paper discusses a two-dimensional model of the propagation of cosmic-ray (CR) nuclei in galaxies, in which cosmic rays, produced in the galactic plane, diffuse into a halo and are convected outward in a galactic wind. Analytical solutions of the convection-diffusion equation are presented for protons and low-energy electrons, nuclei subject to fragmentation, and radioactive nuclei, assuming a linear increase of the convection velocity with distance from the plane, and allowing for an energy-dependent diffusion coefficient. The differences compared to the classical diffusion model are shown, and constraints on model parameters from CR observations and gamma-ray observations of the Milky Way are presented. On the basis of a comparison of model predictions with the observed grammage traversed by cosmic rays and the observed abundance of radioactive Be-10, it is concluded that the effective CR scale height in the solar vicinity is not greater than 3 kpc, independent of the presence of a Galactic wind.

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