Solar cycle dependence of the radial gradient of cosmic ray intensity

Details Solar cycle dependence of the radial gradient of cosmic ray intensity Solar cycle dependence of the radial gradient of cosmic ray intensity

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1527v&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Dec. 1988, p. 1527-1530.

Physics

12

Cosmic Rays, Interplanetary Space, Solar Cycles, Modulation, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Sunspot Cycle

Scientific paper

Observation of the interplanetary intensity of cosmic rays (Ep greater than 80 MeV) by Pioneers 10 and 11 now spans a 16-year time period 1972-1988 and heliocentric radial distances, out to 43.7 AU for Pioneer 10 and 25.8 AU for Pioneer 11. Solar modulation continues to be present at the current distances of both spacecraft. The radial gradient of intensity is measured continuously over the slowly varying, outward moving radial segment r10-r11. The 50-day mean values of the gradient G vary systematically and cyclically in phase with solar activity as measured by sunspot number, with a maximum value of about 2.1 percent/AU at sunspot maximum and a minimum value of about 1.2 percent/AU at sunspot minimum.

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