Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976azh....53..501b&link_type=abstract
Astronomicheskii Zhurnal, vol. 53, May-June 1976, p. 501-510. In Russian.
Astronomy and Astrophysics
Astronomy
Cosmic Rays, Galactic Radiation, Magnetically Trapped Particles, Milky Way Galaxy, Particle Diffusion, Supernova Remnants, Astronomical Models, Chemical Composition, Convection, Lines Of Force, Radiation Spectra
Scientific paper
A convective model of galactic cosmic-ray propagation is proposed in which most cosmic rays propagate after being frozen into closed traps formed by the magnetic fields of supernova remnants (SNRs). Formation processes for such traps at early stages of SNR evolution are examined along with the stability of the traps. It is found that the lifetime of traps in the Galaxy may significantly exceed the corresponding diffusion time of a single particle, which decreases considerably the source intensity requirements that have burdened the diffusion model. It is shown that the proposed model does not contradict available observational data and that the observed steepening of the cosmic-ray energy spectrum slope in the range from 1000 to 10,000 GeV is associated with the fact that the Larmor radius of particles with energies above this range becomes equivalent to the trap dimensions. As a result, such particles escape from the traps and diffuse from the galactic disk faster than they would if they propagated together with the traps. A program to search for closed traps near young and old SNRs is suggested.
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