Saturn's radio emissions - Rotational modulation

Details Saturn's radio emissions - Rotational modulation Saturn's radio emissions - Rotational modulation

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..737g&link_type=abstract

Nature, vol. 292, Aug. 20, 1981, p. 737-739.

Astronomy and Astrophysics

Astronomy

14

Planetary Radiation, Radio Emission, Saturn Atmosphere, Saturn Rings, Spaceborne Astronomy, Electric Discharges, Electrostatic Charge, Field Aligned Currents, Pioneer 11 Space Probe, Planetary Ionospheres, Planetary Magnetospheres, Planetary Rotation, Radio Astronomy, Ring Currents, Voyager 1 Spacecraft, Saturn, Radioemissions, Rotation, Modulation, Kilometer Waves, Flux, Wavelengths, Electrostatic Properties, Voyager 1, Geometry, Shadows, Dipole, Electric Fields, Rings, Currents, Diagrams, Ionosphere, Ions

Scientific paper

Observational data provided by Pioneer 11 and Voyager 1 have revealed that the Saturnian ring system has important effects on the structures of the planetary ionosphere as well as the magnetospheric environment, such as the unexpected rotational modulation of the Saturn kilometric radiation (SKR) and the Saturn electrostatic discharge (SED) as discovered by the Voyager planetary radio astronomy experiment. The challenge arises to devise a mechanism which can produce electrodynamic coupling between the ring system and the planetary ionosphere and/or magnetosphere in which the associated SKR and SED radio emissions are subject to longitudinal control. One candidate is the establishment of field-aligned current systems, connecting the rings and the ionosphere with longitudinal variation. Local acceleration processes in the vicinity of the rings are also needed. The interplay between the ring-current systems and the geometry of the dipole field and the rings is discussed, and a description is presented of some of the basic ingredients in the longitudinal modulations of SKR and SED.

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