An Updated View of Saturn's Upper Atmosphere From a Reanalysis of the Voyager 1 and 2 UVS Occultations

Details An Updated View of Saturn's Upper Atmosphere From a Reanalysis of the Voyager 1 and 2 UVS Occultations An Updated View of Saturn's Upper Atmosphere From a Reanalysis of the Voyager 1 and 2 UVS Occultations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p51b1436v&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P51B-1436

Physics

5700 Planetology: Fluid Planets, 5704 Atmospheres: Composition And Chemistry, 5707 Atmospheres: Structure And Dynamics, 6275 Saturn, 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707)

Scientific paper

The Voyager 1 and 2 Ultraviolet Spectrometer (UVS) solar and stellar occultation data set represents one of the primary, pre-Cassini sources of information that we have on the neutral upper atmosphere of Saturn. Despite its importance, however, the full set of occultations has never received a consistent analysis, and the results derived from the initial analyses over twenty years ago left questions about the temperature and density profiles unanswered. We have reanalyzed all six of the UVS occultations (three solar and three stellar) to provide an up-to-date, pre-Cassini view of Saturn's upper atmosphere. This analysis has resulted in altitude profiles for H2, H, CH4, C2H2, C2H4, and C2H6 as well as information on the temperature structure. In addition, our analysis provides an explanation for the two different thermospheric temperatures derived in earlier analyses (400-450 K versus 800 K) as well as the unusual shape of the total density profile noted by Hubbard et al. (Icarus, 130, 404-425, 1997). The results of our reanalysis will provide a useful baseline for interpreting new data from Cassini, particularly in the context of change over the past two decades.

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