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Article Dans Une Revue Science Année : 2005

Titan's Atmospheric Temperatures, Winds, and Composition

M. E. Segura
  • Fonction : Auteur
Peter A. Ade
  • Fonction : Auteur

Résumé

Temperatures obtained from early Cassini infrared observations of Titan show a stratopause at an altitude of 310 kilometers (and 186 kelvin at 15°S). Stratospheric temperatures are coldest in the winter northern hemisphere, with zonal winds reaching 160 meters per second. The concentrations of several stratospheric organic compounds are enhanced at mid- and high northern latitudes, and the strong zonal winds may inhibit mixing between these latitudes and the rest of Titan. Above the south pole, temperatures in the stratosphere are 4 to 5 kelvin cooler than at the equator. The stratospheric mole fractions of methane and carbon monoxide are (1.6 +/- 0.5) × 10-2 and (4.5 +/- 1.5) × 10-5, respectively.
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Dates et versions

hal-03785584 , version 1 (23-09-2022)

Identifiants

Citer

Michael Flasar, Richard K. Achterberg, Barney J. Conrath, Peter J. Gierasch, Virgil G. Kunde, et al.. Titan's Atmospheric Temperatures, Winds, and Composition. Science, 2005, 308, pp.975-978. ⟨10.1126/science.1111150⟩. ⟨hal-03785584⟩
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