Propagation of a large Forbush decrease in cosmic-ray intensity past the earth, Pioneer 11 at 34 AU and Pioneer 10 at 53 AU

Details Propagation of a large Forbush decrease in cosmic-ray intensity past the earth, Pioneer 11 at 34 AU and Pioneer 10 at 53 AU Propagation of a large Forbush decrease in cosmic-ray intensity past the earth, Pioneer 11 at 34 AU and Pioneer 10 at 53 AU

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1423v&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 14, July 24, 1992, p. 1423-1426.

Physics

43

Cosmic Ray Showers, Earth Atmosphere, Forbush Decreases, Solar Flares, Wave Propagation, Proton Energy, Radial Velocity

Scientific paper

Observations of a large Forbush decrease in cosmic-ray intensity at the earth, Pioneer II and Pioneer 10 are reported. The Pioneer 10 data show a large impulsive decrease in cosmic-ray intensity at the greatest distance from the sun observed to date. The apparent radial speed of propagation of the Forbush decrease was about 820 km/s, independent of the radial distance. The observations reported here and similar previous observations provide the basis for a new quantitative model of the propagation of Forbush decreases in the outer heliosphere.

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