Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275l..15e&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. L15-L18.
Astronomy and Astrophysics
Astrophysics
53
Charged Particles, Energy Spectra, Galactic Cosmic Rays, Solar Cycles, Solar Wind, Stellar Models, Interplanetary Medium, Kinetic Energy, Particle Interactions, Spectrum Analysis
Scientific paper
The predictions of a conventional, spherically symmetric model of solar modulation have been compared with the measured spectra of positively and negatively charged galactic cosmic-ray particles at 1 AU throughout the 1965-1976 solar cycle and through the enhanced modulation of 1979. For the proton/helium, proton/electron, and helium/electron flux ratios, there is remarkably good agreement between theory and experiment, except for small differences in 1965 and 1969. Possible systematic experimental errors are discussed, and it is concluded that: (1) the 11 year modulation process is largely independent of the sign of the particle charge; and (2) the assumption of steady state is a fairly good approximation for long term modulation.
Evenson Paul
Garcia-Munoz Manuel
Meyer Pascal
Pyle Roger K.
Simpson André J.
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