Forbush decreases and particle acceleration in the outer heliosphere

Details Forbush decreases and particle acceleration in the outer heliosphere Forbush decreases and particle acceleration in the outer heliosphere

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..761v&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, May 1990, p. 761-764.

Physics

14

Aerology, Forbush Decreases, Heliosphere, Particle Acceleration, Solar Activity, Galactic Cosmic Rays, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Propagation Velocity, Solar Flares, Solar Terrestrial Interactions, Solar Wind

Scientific paper

Consideration is given to Pioneer 10 and 11 observations of the solar flares that occurred during the period March 6-19, 1989. The observations shown that Forbush decreases propagate with an essentially constant magnitude to 47 AU and with similar magnitude at widely different ecliptic longitudes. The times of recovery from Forbush decreases become progressively greater as the radial distance increases. A scheme is proposed to explain this behavior, giving support to the hypothesis that the solar cycle modulation of the galactic cosmic ray intensity is attributable primarily to overlapping Forbush decreases that are more frequenct and of greater magnitude near times of maximum solar activity.

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