Saturnian trapped radiation and its absorption by satellites and rings - The first results from Pioneer 11

Details Saturnian trapped radiation and its absorption by satellites and rings - The first results from Pioneer 11 Saturnian trapped radiation and its absorption by satellites and rings - The first results from Pioneer 11

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980sci...207..411s&link_type=abstract

Science, vol. 207, Jan. 25, 1980, p. 411-415.

Computer Science

7

Natural Satellites, Pioneer 11 Space Probe, Radiation Absorption, Radiation Belts, Saturn (Planet), Saturn Rings, Charge Distribution, Charged Particles, Electron Distribution, Inner Radiation Belt, Magnetic Dipoles, Particle Acceleration, Planetary Magnetic Fields, Proton Belts, Space Exploration, Saturn, Radiation, Absorption, Satellites, Rings, Pioneer 11, Flux, Electrons, Protons, Magnetic Fields, Distribution, Mimas, Janus, Charged Particles, Transport, Diffusion, Magnetosphere, Intensity, Dipole Momen

Scientific paper

Preliminary results from Pioneer 11 concerning the acceleration and trapping of charged particles in the magnetic field of Saturn are reported. The identification and measurement of the intensities and spectra of charged particle species was performed by an experiment including four charged particle sensor systems, within 20 Saturn radii of the planet. Increases in the intensity of 0.5- to 1.8-MeV protons within 15 Saturn radii indicate the trapping and acceleration of particles in the dipole field region, while a decrease in proton intensity between seven and four Saturn radii is attributed to absorption by Dione and Enceladus and possibly ring material as well. Proton and electron intensity distributions are found to be axially symmetric within four Saturn radii, indicating a centered dipole aligned with the planetary rotation axis. Trapped radiation absorption at the orbit of Mimas is analyzed to obtain an upper limit of 4 x 10 to the -8th Saturn radii-squared/sec to the inward diffusion coefficient; an absorption-like feature observed at L = 2.5 is attributed to a previously unidentified satellite of diameter less than 200 km and semimajor axis 2.51 Saturn radii. Radiation absorption by the newly discovered F ring was also observed, however beneath the A, B and C rings a low flux of high-energy electrons was detected.

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