Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248.1156j&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 15, 1981, p. 1156-1161.
Astronomy and Astrophysics
Astrophysics
70
Cosmic Rays, Diffusion Coefficient, Particle Acceleration, Particle Diffusion, Plasma Drift, Radiation Transport, Solar Wind, Computerized Simulation, Energy Spectra, Equatorial Atmosphere, Heliosphere, Mean Free Path
Scientific paper
Results from numerical simulations of cosmic-ray modulations by the solar wind are presented which show that the scattering mean free path should be larger than the particle gyroradius in the average magnetic field. It is found that the difference between drift and no-drift solutions is not as great as in previous simulations, which violated the mean free path constraint stated. Profound effects are still noted for the drifts, which determine the origin of the bulk of the cosmic rays seen at any given time in the inner solar system. Accordingly, during the 1975 solar minimum, the positively charged cosmic rays seen in the inner solar system came primarily from the outer boundary near the heliospheric poles while negative particles came from the equatorial regions of the boundary.
Davila Jose Manuel
Jokipii Randy J.
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