Physics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1459m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1459-1464. Research supported by the South African M
Physics
46
Neutron Flux Density, Particle Intensity, Solar Cosmic Rays, Latitude, Sea Level
Scientific paper
A latitude survey of the cosmic ray intensity at sea level was conducted during the 1986/1987 solar minimum period. The results show that the differential response function for the 1986/1987 solar minimum agrees well with that measured in 1965. Both these response functions are significantly lower than those for 1976 and 1954. This result supports the 22-year modulation cycle as predicted, for example, by models including drift effects of the charged cosmic ray particles in the large-scale interplanetary magnetic field. A crossover of the spectra at rigidities of about 7 GV was also observed. Such a crossover is necessary to explain both the stationary neutron monitor counting rates and the lower-energy balloon and space observations in consecutive solar cycles.
Moraal Harm
Potgieter Marius S.
Stoker Pieter H.
van der Walt A. J.
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