Comparison of distributed acceleration and standard models of cosmic-ray transport

Details Comparison of distributed acceleration and standard models of cosmic-ray transport Comparison of distributed acceleration and standard models of cosmic-ray transport

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...65l&link_type=abstract

Advances in Space Research, vol. 15, no. 1, p. (1)65-(1)68

Astronomy and Astrophysics

Astronomy

1

Abundance, Astronomical Models, Galactic Cosmic Rays, Radiation Sources, Radiation Transport, Mathematical Models, Particle Acceleration, Particle Energy, Transport Theory

Scientific paper

Recent cosmic-ray abundance measurements for elements in the range 3 less than or equal to Z less than or equal to 28 and energies 10 MeV/n less than or equal to E less than or equal to 1 TeV/n have been analyzed with computer transport modeling. About 500 elemental and isotopic measurements have been explored in this analysis. The transport code includes the effects of ionization losses, nuclear spallation reactions (including those of secondaries), all nuclear decay modes, stripping and attachment of electrons, escape from the Galaxy, weak reacceleration and solar modulation. Four models of reacceleration (with several submodels of various reacceleration strengths) were explored. A chi 2 analysis show that the reacceleration models yield at least equally good fits to the data as the standard propagation model. However, with reacceleration, the ad hoc assumptions of the standard model regarding discontinuities in the energy dependence of the mean path length traversed by cosmic rays, and in the momentum spectrum of the cosmic-ray source spectrum are eliminated. Futhermore, the difficulty between rigidity dependent leakage and energy independent anisotropy below energies of 1014 eV is alleviated.

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