Decimetric radio observations of Saturn and Uranus

Astronomy and Astrophysics – Astronomy

Scientific paper

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Brightness Temperature, Decimeter Waves, Planetary Radiation, Radio Astronomy, Saturn (Planet), Uranus (Planet), Ammonia, Microwave Interferometers, Radiant Flux Density, Saturn Rings, Spectral Resolution, Surface Temperature, Synchrotron Radiation, Planets, Saturn, Uranus, Radar, Telescopic Observations, Opacity, Wavelengths, Decimeter Waves, Brightness Temperature, Rings, Spectrum, Ammonia, Mixing, Atmosphere, Emissions, Data, Models, Thermal Radiation, Absorption, Flux Density, Radiation, Interferometer,

Scientific paper

Observations of the planets Saturn and Uranus at 18 and 31 cm are described. The brightness temperature of Saturn, corrected for the effects of the rings, is 214 plus or minus 9 K at 18 cm and 243 plus or minus 12 K at 31 cm and the brightness temperature of Uranus is 291 plus or minus 65 K at 18 cm. No synchrotron emission from Saturn is detected, the equivalent upper limit at a distance of 8 AU being 5.0 mJy, which is 0.3 per cent of the Jovian synchrotron emission referred to the same distance. The spectrum of Saturn suggests that the ammonia mixing-ratio may be 0.0003, which is double the value expected for material of solar composition. The Uranus measurement is compatible with model atmospheres discussed by Gulkis et al. (1978).

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