Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..763v&link_type=abstract
Astrophysical Journal, Part 1, vol. 238, June 1, 1980, p. 763-767. Navy-supported research;
Astronomy and Astrophysics
Astronomy
9
Cosmic Rays, Galactic Radiation, Interplanetary Medium, Radiant Flux Density, Radiation Distribution, Latitude, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Spaceborne Astronomy, Spectroheliographs, Time Dependence
Scientific paper
The paper reports observations to heliocentric radial distances of 8.6 and 18.4 AU with Pioneer 11 and Pioneer 10 respectively. During a seven year period from March 1972 to March 1979, the galactic cosmic-ray intensity of greater than 80 MeV, as measured by detectors on Pioneers 10 and 11, exhibited aperiodic temporal variations by about a factor of 2 and on a time scale of the order of a year, and quasipersistent cyclic variations of a 26 day period and an amplitude of a few percent. For protons of an energy greater than 80 MeV, there is a fairly consistent heliocentric radial gradient of +2.1 (plus or minus 0.3%) per AU in integral intensity until 1978 April-May, at which time a substantial disruption of the distribution of cosmic rays in the heliosphere occurred.
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