Saturn's ionosphere - Inferred electron densities

Details Saturn's ionosphere - Inferred electron densities Saturn's ionosphere - Inferred electron densities

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.2371k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, April 1, 1984, p. 2371-2376.

Physics

40

Electron Density Profiles, Ionospheric Electron Density, Planetary Ionospheres, Saturn (Planet), Lightning, Planetary Atmospheres, Radio Wave Refraction, Radio Waves, Wave Reflection, Saturn, Ionosphere, Electrons, Density, Voyager Missions, Emissions, Origin, Source, Atmosphere, Lightning, Storms, Frequencies, Bursts, Radio Waves, Refraction, Reflection, Latitude, Comparisons, Pioneer 11, Models, Dayside, Diurnal Variations, Theoretical Studies, Rings, Observations, Analysis

Scientific paper

During the two Voyager encounters with Saturn, radio bursts were detected which appear to have originated from atmospheric lightning storms. Although these bursts generally extended over frequencies from as low as 100 kHz to the upper detection limit of the instrument, 40 MHz, they often exhibited a sharp but variable low frequency cutoff below which bursts were not detected. We interpret the variable low-frequency extent of these bursts to be due to the reflection of the radio waves as they propagate through an ionosphere which varies with local time. We obtain estimates of electron densities at a variety of latitude and local time locations. These compare well with the dawn and dusk densities measured by the Pioneer 11 Voyager Radio Science investigations, and with model predictions for dayside densities. However, we infer a two-order-of-magnitude diurnal variation of electron density, which had not been anticipated by theoretical models of Saturn's ionosphere, and an equally dramatic extinction of ionospheric electron density by Saturn's rings. Previously announced in STAR as N84-17102

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