Other
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.0402w&link_type=abstract
American Astronomical Society, DPS meeting #39, #4.02; Bulletin of the American Astronomical Society, Vol. 39, p.413
Other
Scientific paper
After three years in orbit around Saturn the Cassini Ultraviolet Imaging Spectrograph (UVIS) has accumulated spectral cubes (two spatial dimensions, one spectral dimension at a variety of phase angles (25 to 140 degrees). Here we are interested in the spectral range 160 to 185 nm which shows prominent acetylene absorption features. Latitude coverage is good for the southern hemisphere but there are gaps at northern latitudes due to both viewing and lighting constraints and interference from Saturn's rings. The combined spatial resolution and phase angle coverage provides new and significant constraints on abundance profiles of acetylene and other gas constituents, and stratospheric aerosols. Ultimately we plan to determine latitude gradients of acetylene and other trace constituents to constrain models of the meridional circulation and seasonal variations. At present we have determined that species profiles which provide a good fit to earlier Hubble Space Telescope UV spectra do not provide the best fit to the Cassini data at the same latitude.
Tice Dane
West Robert A.
Yung Yuk
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