The anisotropies of galactic cosmic rays:: 3-dimensional modeling

We report on model calculations for the anisotropies of galactic cosmic rays at the orbit of the Earth. We consider the 5 - 25 GV range where the diffusion approximation is still applicable. The predicted ecliptic and North-South components of the anisotropy in various 2-dimensional (2-D) and 3-dimensional (3-D) models are discussed. Our 3-D numerical code, including large-scale particle drifts in a model heliosphere with a wavy current sheet and corotating interaction regions (CIRs), is extended to calculate anisotropies, Simulation results obtained for the two opposite magnetic cycles are presented for 3-D models with uniform solar wind speed as well as for those with CIRs included, Recurrent 27-day variations are discussed. (C) 2001 COSPAR. Published by Elsevier Science Ltd. All rights reserved.