Titan's upper atmosphere - Composition and temperature from the EUV solar occultation results

Details Titan's upper atmosphere - Composition and temperature from the EUV solar occultation results Titan's upper atmosphere - Composition and temperature from the EUV solar occultation results

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.1351s&link_type=abstract

Journal of Geophysical Research, vol. 87, Mar. 1, 1982, p. 1351-1359.

Physics

102

Atmospheric Composition, Atmospheric Temperature, Satellite Atmospheres, Titan, Upper Atmosphere, Extreme Ultraviolet Radiation, Nitrogen, Photochemical Reactions, Stellar Occultation, Terminator Lines, Saturn, Satellites, Titan, Atmosphere, Composition, Temperatures, Data, Occultations, Ultraviolet, Wavelengths, Voyager 1, Spectrometer, Uvs, Ultraviolet Spectrometer, Density, Mixing, Methane, Distance, Acetylene, Absorption, Molecules, Photochemistry, Models, Homopause, Stratosphere, Eddy Diffusion, Observ

Scientific paper

It is inferred from observation of an occultation of the sun by Titan, using the Voyager 1 UV spectrometer, that temperatures are 176 + or - 20 K near the evening terminator and 196 + or - 20 K near the morning terminator, and that the major atmospheric constituent is N2, with a density of 2.7 + or - 0.2 x 10 to the 8th/cu cm at 3840 km. A layer of absorbing molecules, possibly polymers, is found near both morning and evening terminators. A photochemical model suggests that the homopause is located at 3500 + or - 70 km, with an eddy diffusion coefficient of 1(+2, -0.7) x 10 to the 8th/sq cm per sec, which decreases to about 1000 sq cm/sec in the lower stratosphere as N2 to the -2/3 power.

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