Observations of Titan's Mesosphere

Details Observations of Titan's Mesosphere Observations of Titan's Mesosphere

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...629l..57g&link_type=abstract

The Astrophysical Journal, Volume 629, Issue 1, pp. L57-L60.

Astronomy and Astrophysics

Astronomy

5

Infrared: Solar System, Planets And Satellites: General, Radiative Transfer, Techniques: Spectroscopic

Scientific paper

We have recorded spectra of Titan's ν4 band of CH4 at a higher resolving power (R=70,000) than prior measurements to better constrain the thermal structure of Titan's atmosphere from 100 to 600 km altitude. Radiative transfer analyses of the spectra indicate a temperature profile below 300 km that is consistent with past measurements. The high resolving power of our observations provides the first infrared measurement of Titan's thermal structure between 300 and 600 km. We detect the presence of a mesosphere, with a drop of temperature above 380+50-100 km altitude of at least 15 K, consistent with radiative cooling of the atmosphere by emission from hydrocarbons.

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