The 1973-1984 solar modulation of cosmic ray nuclei

Mathematics

Scientific paper

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Cosmic Rays, Energy Spectra, Galactic Nuclei, Mathematical Models, Pulse Modulation, Radiant Flux Density, Steady State, Carbon, Diffusion Coefficient, Equilibrium Equations, Helium, Hysteresis, Oxygen, Protons, Solar Flares

Scientific paper

As a continuation of the program of solar modulation studies, new measurements were carried out with the cosmic ray telescope on the Earth satellite IMP-8, of the intensity time variations and the energy spectra of galactic cosmic ray protons, helium, carbon and oxygen from 1980 through 1984 including the recent solar maximum. In order to test the applicability of a steady state model of solar modulation during a period which includes times of rapidly changing modulation, these fluxes were equated with the predictions of a conventional model of solar modulation which assumes equilibrium between modulation mechanisms. It is found that for a reasonable range of variations of the diffusion coefficient the model predictions can be made to agree with the measurements at essentially all times during the studied period. The model can account also for the observed hysteresis effects between cosmic rays of different rigidities.

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