Measurements of cosmic ray anisotropies from Pioneers 10 and 11

Details Measurements of cosmic ray anisotropies from Pioneers 10 and 11 Measurements of cosmic ray anisotropies from Pioneers 10 and 11

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....4.1519a&link_type=abstract

In: International Cosmic Ray Conference, 14th, Munich, West Germany, August 15-29, 1975, Conference Papers. Volume 4. (A76-26851

Physics

3

Anisotropy, Cerenkov Counters, Cosmic Rays, Energy Spectra, Interplanetary Medium, Pioneer Space Probes, Alpha Particles, Diffusion Coefficient, Heavy Nuclei, Kinetic Energy, Proton Flux Density

Scientific paper

A progress report is presented on cosmic ray anisotropy measurements performed in interplanetary space on the Pioneers 10 and 11. A directional Cerenkov counter, sensitive to protons and alpha particles with kinetic energies exceeding 480 MeV/nucleon, was used to determine east-west and north-south anisotropies. Large variations in anisotropies with a time scale of about 60 days were found for the period April-November 1973. The total data set shows an east-west anisotropy of 0.46 plus or minus 0.11% and a north-south anisotropy of 0.03 plus or minus 0.11%. This result for the east-west anisotropy is compatible with a large value of the ratio of the perpendicular to the parallel components of the diffusion coefficient.

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