Impulsive radio discharges near Saturn

Details Impulsive radio discharges near Saturn Impulsive radio discharges near Saturn

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..716e&link_type=abstract

Nature, vol. 292, Aug. 20, 1981, p. 716-718. NASA-supported research.

Astronomy and Astrophysics

Astronomy

26

Planetary Radiation, Radio Astronomy, Saturn (Planet), Voyager 1 Spacecraft, Electric Discharges, Nonthermal Radiation, Radio Bursts, Radio Emission, Saturn, Radioemissions, Voyager 1, Data, Radio Astronomy, Polarization, Planetary Radio Astronomy Experiment, Electrostatic Emissions, Intensity, Spectrum, Frequencies, Period, Shape, Magnetic Fields, Electric Fields, Models, Source Medium, Pra

Scientific paper

Nonthermal radio emissions from the Saturn system were first detected by the Voyager planetary radio astronomy (PRA) experiment on board Voyager 1 in January 1980. Since then emission between 100 kHz and 1 MHz from the planet, termed Saturn kilometric radiation (SKR), has been received almost continuously. A description is presented of eight characteristics which have been fairly well defined by the Voyager 1 encounter. These include a very flat broadband frequency spectrum, a period of approximately 10 h 10 min, a change in the envelope shape of episodes between pre and postencounter, an intensity population structure typical of plural populations, and an episodic structure of a width of approximately 180 deg. It was found that postencounter episodes continue for about three times as long as preencounter ones, and that postencounter bursts are left-circularly polarized at high frequencies. At least one episode shows the onset of high frequency events some time before that of lower frequency ones.

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