First results from the Cassini radio occultations of the Titan ionosphere

Details First results from the Cassini radio occultations of the Titan ionosphere First results from the Cassini radio occultations of the Titan ionosphere

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11309317k&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A9, CiteID A09317

Physics

24

Ionosphere: Ionosphere/Atmosphere Interactions (0335), Planetary Sciences: Solar System Objects: Titan, Ionosphere: Planetary Ionospheres (5435, 5729, 6026), Radio Science: Ionospheric Physics (1240, 2400)

Scientific paper

The first four sets of radio occultations of the Titan's ionosphere were obtained by the Cassini spacecraft between March 2006 and May 2007. These occultations occurred at middle and high latitudes, at solar zenith angles from about 86° to 96°. The main ionospheric peak was seen, as expected from modeling and previous observations, near 1200 km, with a density of about 1-3 × 103 cm-3. A consistent ledge near 1000 km was also seen, and one of the polar observations found a significant (~3 × 103 cm-3) layer in the region of 500-600 km. This layer also is seen in other observations with a density varying from about 0.7 to 1.7 × 103 cm-3, suggesting a variable production source (or sources) for this peak.

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