Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1797k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Oct. 1991, p. 1797-1800.
Physics
41
Corotation, Galactic Cosmic Rays, Solar Cycles, Solar Magnetic Field, Solar Wind, Boltzmann Transport Equation, Computerized Simulation, Diffusion Coefficient, Mathematical Models, Three Dimensional Models
Scientific paper
The paper presents the first global simulations of the modulation of galactic cosmic rays by a three-dimensional solar wind with corotating interaction regions. The cosmic-ray transport equation is solved in a computed wind and magnetic-field model. The results show both the previously-neglected small-scale response to corotating interaction regions and global, drift-dominated, effects which are similar to previous models. The model predicts a correlation between the local magnetic field and the rate of decrease of the cosmic-ray intensity which is similar to that observed. This is found to be due to inhibited diffusion. It is suggested that such small-scale variations are local and that they do not change significantly the global cosmic-ray structure except, perhaps, near sunspot maximum.
Jokipii Randy J.
Kota József
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