Galactic cosmic-ray intensity 0.99 to 5.26 astronomical units from the sun

Details Galactic cosmic-ray intensity 0.99 to 5.26 astronomical units from the sun Galactic cosmic-ray intensity 0.99 to 5.26 astronomical units from the sun

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..599t&link_type=abstract

Astrophysical Journal, vol. 206, June 1, 1976, pt. 1, p. 599-615. Navy-supported research;

Astronomy and Astrophysics

Astrophysics

6

Cosmic Rays, Galactic Radiation, Interplanetary Medium, Particle Interactions, Radiant Flux Density, Explorer 35 Satellite, Geiger Counters, Graphs (Charts), Interplanetary Space, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Radiation Counters, Solar Activity Effects, Thermoelectric Generators

Scientific paper

The intensity of galactic cosmic radiation in interplanetary space has been observed over the heliocentric radial range 0.99 to 5.26 AU with five Geiger-Mueller tubes on Pioneer 10 and over the range 1.00 to 3.59 AU with three similar tubes on Pioneer 11. The observations span the time period 1972 March 3 to 1974 April 29, near the epoch of minimum solar activity. The contributions of solar energetic particles are eliminated. The effect of temporal trends is removed in a variety of ways - by comparison of simultaneous measurements on the two spacecraft; by comparison with data from Explorer 35 at 1.0 AU; and by comparison with terrestrial neutron monitor data. The radial gradient of the intensity of particles with energies greater than 80 MeV/nucleon is zero to within an experimental uncertainty of less than 2 per cent per AU over the range 0.99 to 5.26 AU. Hence, it is less than the theoretically expected value by at least a factor of 5.

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