On the thermal structure of Uranus

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atmospheric Models, Infrared Radiation, Planetary Temperature, Stratosphere, Temperature Profiles, Uranus (Planet), Atmospheric Temperature, Brightness Temperature, Occultation, Optical Thickness, Pioneer 10 Space Probe, Planetary Atmospheres, Radiative Transfer, Spaceborne Astronomy

Scientific paper

Assuming that the atmospheres of the four giant planets are basically similar, model thermal structures based on radiative equilibrium are calculated for Uranus with emphasis on the importance of the stratospheric temperature inversion. The available IR observations are used to narrow the range of possibilities. Measurements of effective and optical-occultation temperatures are reviewed, it is noted that the customary He-H2 opacity is the dominant thermal opacity for Jupiter, and it is shown that this opacity is compatible with IR observations of Uranus. Several very approximate model temperature profiles are constructed for the planet, and it is found that the spectrum of the model with an effective temperature of 55 K is in best agreement with the observations.

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