Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..263g&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 263-268.
Astronomy and Astrophysics
Astrophysics
16
Cosmic Rays, Energy Spectra, Nuclear Particles, Particle Flux Density, Solar Activity Effects, Alpha Particles, Hysteresis, Magnetic Rigidity, Modulation, Neutron Counters, Proton Energy, Radiation Measurement, Satellite Observation, Solar System, Time Lag
Scientific paper
Residual cosmic-ray modulation at or near the solar minima of 1965 and 1972-75 is compared on the basis of ground-based and satellite observations of nonrelativistic proton and helium components as well as variations in the relativistic component. It is found that the nonrelativistic fluxes lagged behind the high-energy fluxes to form a hysteresis loop over the period from 1965 to 1973, that the 1975 proton fluxes were about 85% higher than the 1972 level and about 35% higher than the 1965 level, and that the 1975 helium fluxes were about 60% higher than in 1965. Some unique recovery events are discussed, and a time-lag effect dependent on magnetic rigidity is examined which was associated with dynamic changes in the heliosphere. A qualitative explanation is offered for the hysteresis effect.
Garcia-Munoz Manuel
Mason Glenn M.
Simpson André J.
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