Titan's atmosphere from Voyager infrared observations. I - The gas composition of Titan's equatorial region

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atmospheric Composition, Infrared Astronomy, Satellite Atmospheres, Titan, Voyager 2 Spacecraft, Abundance, Atmospheric Temperature, Carbon Dioxide, Hydrocarbons, Methane, Nitriles, Radiative Transfer, Saturn, Satellites, Titan, Atmosphere, Infrared, Wavelengths, Abundance, Spacecraft Observations, Voyager 1 Mission, Composition, Spectra, Opacity, Equatorial Regions, Iris Instrument, Stratosphere, Distribution, Altitude, Pressure, Longitude, Comparisons, Spectrometry, Diagrams, Carbon Dioxide, Emissions, Ra

Scientific paper

After inferring minor atmospheric-constituent abundances in Titan's equatorial region from Voyager 1 IR spectra, a stratospheric temperature profile is derived. An analysis of three different sections has yielded stratospheric mole fractions for C2H2, C2H4, C2H6, C3H4, C3H8, C4H2, HCN, and CO2; an altitude-dependent CO2 profile has been tested against observations, but no conclusive data on vertical distribution could be extracted. Emission-line formation for all minor components originates from the 1-20 mbar, or 75-200 km, pressure levels.

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