A multi-spacecraft study of the coronal and interplanetary transport of solar cosmic rays. I, II

Astronomy and Astrophysics – Astronomy

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Particle Flux Density, Solar Corona, Solar Cosmic Rays, Solar Flares, Spaceborne Astronomy, Astronomical Models, Energetic Particles, Interplanetary Medium, Radioactive Decay, Spatial Distribution

Scientific paper

The analysis and interpretation of the multiple-spacecraft observations of a collection of flare events in six energy bands between 3 and 60 MeV/nucleon are presented. The longitudinal and radial dependence of the times of maximum flux, the relative maximum fluxes, and the decay constants, are determined; and the propagation model is compared with a simplified single-spacecraft model. The analytical model developed accounts for the effects of diffusion, convection, adiabatic deceleration, and corotation. The intensity time profiles are calculated for hypothetical spacecraft spaced at 60-deg longitude intervals between -120 and 120 deg. It is concluded that the large value of k(IP) (greater than or equal to 6 x 10 to the 21st sq cm/s) indicates the nonnegligibility of focused diffusion in the interplanetary modeling of these events.

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