The inapplicability of spatial diffusion models for solar cosmic rays

Details The inapplicability of spatial diffusion models for solar cosmic rays The inapplicability of spatial diffusion models for solar cosmic rays

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..328o&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 1, 1981, p. 328-334.

Astronomy and Astrophysics

Astrophysics

4

Cosmic Rays, Interplanetary Medium, Particle Diffusion, Solar Corpuscular Radiation, Anisotropic Media, Numerical Integration, Solar Flares, Time Response

Scientific paper

It is noted that because of the rapid temporal evolution of the particle density, the interplanetary propagation of solar cosmic rays cannot be accurately described by a spatial diffusion equation. Using a simple numerical integration scheme, it is shown that the pitch-angle scattering equation gives intensity-time profiles and anisotropies very different from the spatial diffusion results in many cases. Reasons are given for the failure of the diffusion limit, and an explanation is offered for the fact that some temporal profiles of solar particle events look diffusive.

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