Numerical simulation of the cosmic ray Forbush decrease.
Abstract
Considering that the effect of shock waves on cosmic ray is simply produced by a disturbed region where the solar wind speed is raised and the diffusion coefficient is reduced. The numerical modeling on the base of solar modulation of galactic cosmic ray is performed. It is found that the decrease of the diffusion coefficient is more effective than the increase of solar wind speed in producing the Forbush decrease. The amplitude of Forbush decrease is getting smaller as it propagates outward. The Forbush decrease when two independent shock waves exist is simply the linear superposition of the two Forbush decreases produced as if the two shock waves exist separately.
 Publication:

Chinese Journal of Space Science
 Pub Date:
 October 1990
 Bibcode:
 1990ChJSS..10..247G
 Keywords:

 Forbush Decreases;
 Galactic Cosmic Rays;
 Shock Waves;
 Diffusion Coefficient;
 Solar Wind Velocity;
 Space Radiation;
 Cosmic Rays: Forbush Effect;
 Cosmic Rays: Solar Modulation;
 Cosmic Rays: Shock Waves