Physics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..785n&link_type=abstract
Journal of Geophysical Research, vol. 88, Feb. 1, 1983, p. 785-791.
Physics
28
Cosmic Rays, Energy Spectra, Fokker-Planck Equation, Forbush Decreases, Particle Energy, Solar Wind, Diffusion Coefficient, Particle Flux Density, Shock Heating, Shock Wave Interaction
Scientific paper
The Fokker-Planck equation of the cosmic ray modulation is used, with an adiabatic energy change term, to model the Forbush decrease in cosmic rays. The spectrum of the cosmic ray energy depression is derived. Independent variables in the equation of Parker (1965, 1966) and Gleeson and Axford (1967) are chosen as radial distance and particle energy. An assumption is made that the front side of the solar wind disturbance is thicker than the shock front. The time scale of the Forbush decrease is larger than the passage of the shock front and remains the same from the pole to low latitudes, implying that the scale size of the solar wind disturbances that affect the particles is larger than the rigidity-dependent mean free path of the particles. It is concluded that the net effect of the solar wind is heating of the cosmic ray particles, and that the spectrum of the cosmic ray intensity decrease is proportional to the reciprocal of the diffusion coefficient. A precursory decrease is expected below 1 GeV.
Nishida Akira
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