36th DPS Meeting, 8-12 November 2004
Session 22 Titan II: Chemistry
Oral, Wednesday, November 10, 2004, 10:30-12:00noon, Lewis

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[22.04] Cassini/CIRS Observations of Titan's Equatorial Region in the Submillimeter Spectral Range

B. Bézard, A. Coustenis, T. Fouchet, E. Lellouch (Obs. Paris-Meudon), B. Conrath (Cornell U.), R. Achterberg (SSAI), D. Jennings, M. Flasar (NASA/GSFC), CIRS Investigation Team

On July 2--3, 2004 UT, the Composite Infrared Spectrometer (CIRS) aboard Cassini recorded spectra of Titan's equatorial latitudes (13S--2N) with a spectral resolution of 0.26 cm-1 (unapodized). We present here the analysis of the average spectrum recorded by the far infrared spectrometer (FP1), covering 10 to 600 cm-1 and corresponding to a total integration time of 4.7 hours. This spectrum shows rotational lines from CO, HCN ,CH4, and possibly H2O. Mean stratospheric abundances of these species have been derived using temperature information from the collision--induced continuum in the FP1 and the 7.7--\mum \nu4 band of methane recorded by the mid-infrared spectrometer in FP4. In particular, analyzing simultaneously the \nu4 band and the rotational lines, prominent in the 70--140 cm-1 range, allows us in principle to disentangle the methane mixing ratio and the temperature profile in the stratosphere, the two components affecting differently the emission observed in the two spectral regions.

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Bulletin of the American Astronomical Society, 36 #4
© 2004. The American Astronomical Soceity.