Physics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..293j&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Feb. 15, 1979, p. 293-296.
Physics
18
Acceleration (Physics), Astronomical Models, Cosmic Rays, Galactic Radiation, Shock Wave Propagation, Transport Properties, Astronomical Spectroscopy, Dynamic Models, Electron Energy, Energy Spectra, Halos, Nonthermal Radiation
Scientific paper
A recently proposed cosmic-ray acceleration mechanism is combined with a model of transport and loss from the Galaxy to construct a model for galactic cosmic rays. Various aspects of the cosmic-ray spectrum, including the secondary-to-primary ratio as a function of energy, are found to fit naturally into the overall picture. A solution to the dynamical-halo model with energy-dependent diffusion coefficient (kappa) is presented. This model is consistent with the observed spectra if kappa is proportional to the square root of the kinetic energy. The observed flattening of the secondary-to-primary ratio below about 1-2 GeV per nucleon is shown to be a natural consequence of the model. Similarly, the primary electron spectrum is predicted to flatten below about 1-2 GeV, which is consistent with deconvolution of the local nonthermal radio spectrum, although the flattening is not quite as much as indicated by the observations.
Higdon James C.
Jokipii Randy J.
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