Propagation of a Forbush decrease in cosmic ray intensity to 15.9 AU

Details Propagation of a Forbush decrease in cosmic ray intensity to 15.9 AU Propagation of a Forbush decrease in cosmic ray intensity to 15.9 AU

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..566v&link_type=abstract

Geophysical Research Letters, vol. 6, July 1979, p. 566-568. Navy-supported research;

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12

Cosmic Rays, Forbush Decreases, Galactic Radiation, Pioneer Space Probes, Plasma Dynamics, Propagation Velocity, Solar Cycles

Scientific paper

By observation of the large Forbush decrease in cosmic-ray intensity of April-May 1978 at heliocentric radial distances of 1.01, 6.97, and 15.91 AU, it is found that the causative magnetized plasma cloud moved outward from the sun at an apparent radial speed of about 960 km/s, independent of radial distance over this range. Recovery from the impulsive decrease in intensity was markedly slower at the larger distances. On the basis of this fact and other considerations, several tentative suggestions are made as to the large-scale nature of Forbush decreases and their relationship to the 11-year solar modulation of galactic cosmic-ray intensity.

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