First results from the ionospheric radio occultations of Saturn by the Cassini spacecraft

Details First results from the ionospheric radio occultations of Saturn by the Cassini spacecraft First results from the ionospheric radio occultations of Saturn by the Cassini spacecraft

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11106310n&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A6, CiteID A06310

Physics

18

Planetary Sciences: Solid Surface Planets: Ionospheres (2459), Ionosphere: Planetary Ionospheres (5435, 5729, 6026), Planetary Sciences: Solar System Objects: Saturn, Planetary Sciences: Solid Surface Planets: Remote Sensing

Scientific paper

The first set of near-equatorial occultations of the Saturn ionosphere was obtained by the Cassini spacecraft between May and September of 2005. The occultations occurred at near-equatorial latitudes, between 10°N and 10°S, at solar zenith angles from about 84° to 96°. The entry observations correspond to dusk conditions and the exit ones to dawn. An initial look at the data indicates that the average peak densities are lower and the peak altitude higher at dawn than at dusk, possibly the result of ionospheric decay during the night hours. There are also significant differences between individual dawn and dusk occultations; the initial thought is that this variation must be connected to changes in the water inflow into the upper atmosphere and/or variations in the particle impact ionization rates.

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