Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.2202b&link_type=abstract
American Astronomical Society, DPS meeting #36, #22.02; Bulletin of the American Astronomical Society, Vol. 36, p.1119
Astronomy and Astrophysics
Astronomy
Scientific paper
On 2004 July 2 and 3 the Composite Infrared Spectrometer (CIRS) on the Cassini spacecraft obtained spectra of Titan at distances ranging between 350,000 and 800,000 km. Zonally averaged spectra were produced every 10 degrees of latitude between Titan's South Pole and the Equator. Stratospheric temperatures in the 0.5 to 5.0 mbar range were obtained by inverting spectra of CH4 in the ν 4 band centered at 1304 cm-1. Carbon dioxide emission at 667 cm-1 from Titan's stratosphere was measured at a spectral resolution of 3.0 cm-1. Carbon monoxide emission was observed in the far infrared (30-65 cm-1) at higher spectral resolution (0.5 cm-1) but at lower spatial resolution (50 degrees of latitude.) Upper limits to H2O emission at 150.5 cm-1 will be presented. Stratospheric emission of CO observed by CIRS will be compared with tropospheric absorption of CO at 4.7 μ m measured in ground-based spectra (Lellouch et al 2003). Comparisons will also be made with observations of CO2 and H2O from the Infrared Space Observatory (Coustenis et al 1998, 2003).
Achterberg Richard K.
Bjoraker Gordon L.
CIRS
Nixon Conor A.
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