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Shock wave effects in solar cosmic ray events

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Abstract

Two low-energy (≲ 1 MeV) solar proton events which display a gradual intensity increase to a maximum near the time of an SSC, followed by an abrupt, large decrease, are interpreted in terms of a population of cosmic rays which are ‘swept’ ahead of an interplanetary shock wave. A model which describes the variation with time of intensity and anisotropy at the Earth is developed using a Monte Carlo technique which traces the histories of particles released impulsively at the Sun. A good fit to each of the profiles observed at 0.6 to 0.9 MeV proton energies is obtained with a diffusion coefficient κ ≈ 2 × 1020 cm2 s−) = 13.46 - 2.99 sin21 and a near perfect shock reflector.

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Authors and Affiliations

  1. Division of Radiophysics, CSIRO, Sydney, Australia

    I. D. Palmer

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  1. I. D. Palmer
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Now at University of California, LASL, Los Alamos, New Mexico.

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Palmer, I.D. Shock wave effects in solar cosmic ray events. Sol Phys 27, 466–477 (1972). https://doi.org/10.1007/BF00153117

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  • DOI: https://doi.org/10.1007/BF00153117

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