Other
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2017n&link_type=abstract
American Astronomical Society, DPS meeting #28, #20.17; Bulletin of the American Astronomical Society, Vol. 28, p.1132
Other
Scientific paper
The Cassini/Huygens mission to the Saturnian system, which is scheduled for launch late next year, will study the moon Titan in unprecedented detail. Onboard the orbiter will be CIRS - the Composite Infrared Spectrometer - which will, amongst many tasks, provide a wealth of information on Titan's atmosphere. This enigmatic world is known to have a massive, mainly nitrogen atmosphere, but important questions remain; in particular the abundance of argon, and the state of methane in the troposphere, where patchy clouds may form and some sort of rainfall is likely. The infrared data from CIRS will help to resolve these and other issues. When CIRS makes measurements of the limb, the field of view must be taken into account. Not only is the width important, but there is also an unusual weighting function due to the slight asymmetry in response of some of the detector elements, which must be taken into account when the spectral data is analysed. We have developed a radiative transfer code to model the infrared signature of the atmosphere from 10 to 1400 cm(-1) , for nadir and limb sightlines, at the CIRS resolution of 0.5 cm(-1) . We also present measurements made at Oxford of the responses of individual detectors. Finally, we show limb spectra calculated for different heights in the atmosphere convolved with the detector responses, to demonstrate the importance of the field-of-view effect on the scientific objectives.
Calcutt Simon B.
Nixon Conor A.
Taylor Fred W.
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