Numerical simulation of the cosmic ray Forbush decrease

Details Numerical simulation of the cosmic ray Forbush decrease Numerical simulation of the cosmic ray Forbush decrease

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990chjss..10..247g&link_type=abstract

Chinese Journal of Space Science (ISSN 0254-6124), vol. 10, no. 4, Oct. 1990, p. 247-255. In Chinese.

Physics

Forbush Decreases, Galactic Cosmic Rays, Shock Waves, Diffusion Coefficient, Solar Wind Velocity

Scientific paper

Taking into account 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, numerical modeling based on solar modulation of Galactic cosmic rays 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 the Forbush decrease gets 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.

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