Magnetic field orientations in Saturn's upper ionosphere inferred from Voyager radio occultations

Details Magnetic field orientations in Saturn's upper ionosphere inferred from Voyager radio occultations Magnetic field orientations in Saturn's upper ionosphere inferred from Voyager radio occultations

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89...65h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 65-73.

Physics

8

Ionospheric Disturbances, Magnetic Field Configurations, Planetary Ionospheres, Planetary Magnetic Fields, Radio Occultation, Saturn Atmosphere, Space Plasmas, Upper Ionosphere, Ionospheric Electron Density, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Saturn, Ionosphere, Magnetic Fields, Radio Observations, Occultations, Voyager Missions, Spectra, Amplitude, Scattering, Anisotropy, Density, Comparisons, Theoretical Studies, Parameters, Electrons, Power Laws

Scientific paper

The radio scintillations observed during occultations of Voyagers 1 and 2 by Saturn are analyzed to determine the morphology of plasma irregularities and hence the magnetic field orientation in Saturn's upper atmosphere. The measurement techniques, the weak scattering theory, and the method used to relate the observed radio scintillations to physical properties of the ionospheric irregularities are briefly described. Results on the spatial characteristics of the irregularities are presented, and the magnetic field orientation in Saturn's ionosphere is inferred. Although the occultation measurements generally confirm the accuracy of the Saturnian magnetic field model of Connerney et al. (1982), it is found that a small adjustment of the coefficients in that model's zonal harmonic expansion would remove the discrepancy between the model predictions and the measurements. A strategy for obtaining improved measurements of Saturn's magnetic field from radio occultation observations of scintillations and Faraday rotation using an orbiting spacecraft is briefly discussed.

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