Galactic cosmic ray intensity from 1 to 9 A.U

Details Galactic cosmic ray intensity from 1 to 9 A.U Galactic cosmic ray intensity from 1 to 9 A.U

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..425v&link_type=abstract

Geophysical Research Letters, vol. 3, Aug. 1976, p. 425-428. Navy-supported research;

Physics

5

Cosmic Rays, Galactic Radiation, Interplanetary Magnetic Fields, Solar Rotation, Periodic Variations, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Radial Distribution, Spacecraft Trajectories, Time Lag

Scientific paper

The paper is concerned with comparative observations of galactic cosmic ray intensity from 1 to 9 AU during the period April 1973-January 1976. The dominant intensity variation is found to be a coherent temporal one with a peak-to-peak amplitude of about 35% of the mean, while a further cyclic variation of about 8% peak-to-peak was found to have a 26-day period and is attributed to solar-corotating interplanetary magnetic field structures. Detailed time lag analysis of the intensity ratios for the two spacecraft yields a radial gradient of +2.0 (plus or minus 0.5) percent per AU, integral above a particle energy of 80 MeV/nucleon.

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