Observations of energetic ions and electrons in Saturn's magnetosphere

Details Observations of energetic ions and electrons in Saturn's magnetosphere Observations of energetic ions and electrons in Saturn's magnetosphere

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980sci...207..421t&link_type=abstract

Science, vol. 207, Jan. 25, 1980, p. 421-425.

Physics

8

Energetic Particles, Pioneer 11 Space Probe, Planetary Magnetospheres, Saturn Atmosphere, Angular Distribution, Cosmic Rays, Energy Spectra, Helium, High Energy Electrons, Ions, Saturn, Ions, Observations, Electrons, Magnetosphere, Pioneer 11, Dynamics, Regions, Protons, Rings, Flux, Energy, Satellites, Distribution, Cosmic Rays, Anisotropy, Particles, Diffusion, Data

Scientific paper

Observations of the magnetosphere of Saturn made by the cosmic-ray experiment on board Pioneer 11 are summarized. Detailed energy spectra and angular distributions of protons from 0.2 to 22 MeV and electrons from 0.1 to 2 MeV were obtained, together with measurements of helium nuclei between 0.65 and 22 MeV/n. The time histories of proton and electron data suggest a division of the Saturn magnetosphere into three regions: (1) an outer magnetosphere between 17 and 7.5 Saturn radii, which is characterized by monotonically increasing fluxes and spectral hardening inward from the magnetosphere, with large changes in low-energy electron angular distributions; (2) a slot region between 7.5 and 4 Saturn radii where marked decreases in proton and low-energy electron fluxes are observed, apparently due to the presence of Dione, Tethys and Enceladus; and (3) an inner region between 4 Saturn radii and the ring edge, which exhibits sharp increases in proton fluxes with energies up to 20 MeV, which are broken near the orbits of Mimas, Janus and possibly S 11. A sharp cutoff of proton and electron fluxes is observed just beyond the nominal edge of the A ring.

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