The general circulation of Titan and the topside escape rates of N2, CH4, and H2

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[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [3367] Atmospheric Processes / Theoretical Modeling, [3369] Atmospheric Processes / Thermospheric Dynamics, [6281] Planetary Sciences: Solar System Objects / Titan

Scientific paper

The general circulation of the atmosphere can have a significant impact on the escape of species from the upper atmospheres of planets (cf. Hartle and Mayer [1976]). Recently, Bell et al. [2009] used a one-dimensional (1-D) model to constrain mass loss rates from Titan’s upper atmosphere for both CH4 and H2. We report on the impacts of the 3-D circulation of Titan on the estimated escape fluxes of nitrogen, methane, and hydrogen. We present two scenarios for CH4 escape from Titan’s upper atmosphere: (1) a hydrodynamic escape scenario (Strobel [2009]) and (2) a low escape scenario (Bell et al [2009]). The composition, dynamics, and energetics of these two configurations will be discussed within the context of recent INMS measurements in the thermosphere and recent magnetospheric carbon ion measurements.

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