Voyager infrared observations of Uranus' atmosphere - Thermal structure and dynamics

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Atmospheric Temperature, Infrared Spectroscopy, Planetary Temperature, Thermal Analysis, Uranus Atmosphere, Voyager 2 Spacecraft, Scale Height, Temperature Distribution, Tropopause, Zonal Flow (Meteorology)

Scientific paper

Temperatures in the Uranus atmosphere are derived from infrared spectrometer (IRIS) observations for a layer between 60 and 200 mbar, which includes the tropopause, where the vertical profile of temperature has a minimum. The variation with latitude of these temperatures and the implied thermal winds are in the same sense as those previously reported at the lower altitude range. The authors discuss the implications of this for dynamical models of the atmospheric thermal and wind structure. Finally, they use a linear, zonally symmetric model with radiative damping and frictional drag to estimate the magnitude of the frictional damping that is needed to account for the tropopause temperatures derived from IRIS observations and the zonal winds inferred from Voyager imaging data.

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