A limit to the velocity of convection of cosmic rays out of the Galaxy

Details A limit to the velocity of convection of cosmic rays out of the Galaxy A limit to the velocity of convection of cosmic rays out of the Galaxy

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icrc....2..131g&link_type=abstract

In: International Cosmic Ray Conference, 16th, Kyoto, Japan, August 6-18, 1979, Conference Papers. Volume 2. (A81-12386 02-93) T

Astronomy and Astrophysics

Astronomy

Astronomical Models, Cosmic Rays, Milky Way Galaxy, Particle Motion, Radiation Distribution, Radiation Sources, Convection, Disk Galaxies, Galactic Evolution, Galactic Structure, Interstellar Gas, Spatial Distribution, Velocity Distribution

Scientific paper

Expressions are derived for the age distributions of cosmic rays in a model of the Galaxy in which the interstellar gas and cosmic ray sources are uniformly distributed in a disk region. The particles diffuse into a halo where diffusion is combined with outward convection. It is shown that a knowledge of the grammage traversed, X, and the surviving fraction of Be-10, fs, sets lower limits but no upper limits to the halo size or mean age of cosmic rays. Provided that fs is not greater than 1/3 an upper limit 16 km/s is set to the outward convection velocity by the value of X.

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