Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.3735v&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, June 1, 1984, p. 3735-3746.
Physics
14
Cosmic Rays, Particle Flux Density, Radial Distribution, Satellite Observation, Solar Activity Effects, Long Term Effects, Voyager 1 Spacecraft, Voyager 2 Spacecraft
Scientific paper
The IMP 8 satellite and Voyager 1 and 2 space probes obtained cosmic ray measurements during the late 1977 to mid-1982 period. Comparisons of 27-day averages of the data show that a positive radial intensity gradient existed on the average during this period, and that the cosmic ray intensity decrease toward solar maximum in 1980-1981 proceeds in a stepwise fashion. The cosmic ray minimum reached in late 1980/early 1981 appears almost simultaneously at 1 AU and at 10 AU, with and without propagation time delay effects, between IMP 8 and the Voyager spacecraft. These data are generally consistent with a heliolatitudinal gradient of 0 + or - 1 percent/deg. Attention is given to the implications of these results in the overall context of cosmic ray modulation theory.
Decker Robert B.
Krimigis Stamatios M.
Venkatesan D.
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