Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.3415c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, April 1, 1985, p. 3415-3427. Research supported by the Max-Planck-Ins
Physics
10
Cosmic Rays, Equatorial Regions, Pioneer 11 Space Probe, Planetary Radiation, Saturn Rings, Electron Photon Cascades, Electron Radiation, Monte Carlo Method, Neutrons, Nucleons, Planetary Magnetospheres, Saturn, Rings, A Ring, B Ring, C Ring, Radiation, Source, Cosmic Rays, Interactions, Flux, Energy, Analysis, Gamma Rays, Particles, Density, Comparisons, Surface, Pioneer 11, Optical Properties
Scientific paper
From measurements on the Pioneer 11 spacecraft, electrons and protons under Saturn's A-B-C rings were reported by Simpson et al. (1980) and Chenette et al. (1980) and identified as the secondary products of cosmic ray nucleons with energies >10 GeV interacting with ring matter. The authors have extended their analysis and have also found both secondary gamma ray fluxes with energies >15 MeV and fragmentation nuclei (H and heavier nuclei) with energies <10 MeV/nucleon, which are consistent with this interpretation. A comparison of the measured low-energy proton and gamma ray fluxes with fluxes from numerical simulations of the secondary particle production and propagation in material slabs (protons) and the Earth's atmosphere (gamma rays) results in an A-B-C ring mean surface density. Direct measurement of the A-B-C ring surface density in radial intervals of ≡300 - 1000 km is obtained from the measured higher-energy secondary particles (electrons >25 MeV and protons >67 MeV). The surface density measurements are shown to be consistent with results derived from Voyager ring radio/optical opacity measurements and the observed damping of density waves in the ring.
Cooper John F.
Eraker J. H.
Simpson André J.
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