Dynamic spectra of Saturn kilometric radiation

Details Dynamic spectra of Saturn kilometric radiation Dynamic spectra of Saturn kilometric radiation

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.8985g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Nov. 1, 1983, p. 8985-8991.

Astronomy and Astrophysics

Astronomy

4

Kilometric Waves, Planetary Radiation, Radio Spectra, Saturn (Planet), Spaceborne Astronomy, Dione, Magnetic Effects, Periodic Variations, Planetary Rotation, Radiant Flux Density, Solar Planetary Interactions, Solar Wind, Spectral Energy Distribution, Voyager 1 Spacecraft

Scientific paper

Dynamic spectra of Saturn kilometric radiation (SKR) obtained by the Voyager planetary radio astronomy experiment have been searched for variations at a time scale longer than that of the arcs (about 1 hour). Two kinds of episodic changes of the shape of the dynamic spectrum can be distinguished: one is an overall long-term change, lasting for one or several Saturn rotations; the other is a modification of the dynamic spectrum from one rotation to another, limited to the sub-solar longitude range from about 270 deg through 0 deg to about 60 deg. Both correspond to a change in the shape of the intensity spectrum of the emission. The long-term variation probably contains the so-called 'Dione gaps', together with similar and sometimes much longer events. The already discovered influence of strong solar wind activity corresponds to increases of the average intensity level of the emission, but not to changes in the shape of its intensity spectrum. Both kinds of episodic spectral variations are usually observed in magnetically quiet conditions, in particular when Saturn enters Jupiter's magnetic tail. These changes of the SKR spectrum are compared with those already observed in the terrestrial kilometric radiation. They could be due to complex propagation effects, temporary modifications of the emission beam or changes in the source altitude.

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