Numerical modeling of the 22-year variation of the cosmic ray intensity and anisotropy

Physics

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Anisotropic Media, Galactic Cosmic Rays, Heliosphere, Periodic Variations, Density Distribution, Diffusion Theory, Interplanetary Magnetic Fields, Long Term Effects, Radial Distribution, Shock Wave Propagation, Steady State

Scientific paper

The authors have solved the two-dimensional time-dependent diffusion-convection equation numerically to obtain the distribution and anisotropy of cosmic rays in the heliosphere. They have assumed that the parallel and perpendicular mean free paths are proportional to the particle Larmor radius, and they have treated each proportionality constant (a,b) as a parameter. The authors have found that the set (a,b) = (4,2) gives the steady state solution compatible with observations on the intensity and the solar diurnal anisotropy of cosmic rays in 0.5- to 10-GeV range as obtained at the earth. They discuss the nature of the solution in order to understand the effect of the density gradient drift motion on the cosmic ray distribution.

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