Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..48...21p&link_type=abstract
Astrophysics and Space Science, vol. 48, no. 1, May 1977, p. 21-46.
Astronomy and Astrophysics
Astrophysics
40
Astronomical Models, Chemical Composition, Cosmic Rays, Galactic Radiation, Cosmic Ray Showers, Diffuse Radiation, Electron Energy, Galactic Radio Waves, Galactic Structure, Gamma Rays, Interstellar Magnetic Fields
Scientific paper
A simple model of cosmic-ray propagation is proposed from which the major experimental results can be derived. The model reproduces the observed nuclear abundances and accounts for the observed changes of nuclear composition with energy, the high degree of isotropy of cosmic-ray flux at all energies, and the high degree of its constancy throughout the history of the solar system. It is consistent with the observed size distribution of extensive air showers, the intensity and energy distribution of the electron component, and the diffuse emission of gamma-rays and radio waves. The model is characterized by two basic assumptions: (1) that cosmic rays have been injected at an unchanging rate by sources located in the galactic spiral arms and (2) that a large-scale magnetic field retains all particles of our Galaxy, where they interact with interstellar gas, so that all complex nuclei are finally fragmented and their energy dissipated in meson production and electromagnetic interactions.
Peters Bill
Westergaard Niels Joergen
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