Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pazh....9..177m&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 9, Mar. 1983, p. 177-180) Soviet Astronomy Letters (ISSN 0360-0327), vol. 9, Mar.-Apr.
Astronomy and Astrophysics
Astronomy
Brightness Temperature, Microwave Emission, Planetary Radiation, Radio Astronomy, Uranus Atmosphere, Radiant Flux Density, Solar Planetary Interactions, Sunlight
Scientific paper
New observations which show that the brightness temperature of Uranus is increasing, depending on the intensity of the sunlight, are presented. The planet was observed with the RATAN-600 radio telescope at wavelengths of 2.08 and 3.9 cm in February 1980 and at 7.6 cm in February 1981. Brightness temperatures of 232 + or - 8 K, 248 + or - 10 K, and 247 + or - 14 K, respectively, were obtained for those wavelengths. The long-term variability in the centimeter radio emission of Uranus is consistent with some of the planet's radio emission being generated by the synchrotron mechanism. However, the radio intensity variation has no diurnal term larger than 5 percent. In view of the time dependence of the spectral index, it seems plausible to interpret the trend in the brightness temperature as a latitude dependence of the ammonia abundance height profile.
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