First Cassini Three-frequency Radio Occultation Observations of the Atmosphere and Ionosphere of Saturn

Details First Cassini Three-frequency Radio Occultation Observations of the Atmosphere and Ionosphere of Saturn First Cassini Three-frequency Radio Occultation Observations of the Atmosphere and Ionosphere of Saturn

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusm.p14a..06k&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #P14A-06

Physics

5704 Atmospheres: Composition And Chemistry, 5707 Atmospheres: Structure And Dynamics, 5729 Ionospheres (2459), 6904 Atmospheric Propagation, 6929 Ionospheric Physics (2409)

Scientific paper

The first Cassini radio occultation observations of the atmosphere and ionosphere of Saturn were made on May 3rd, 2005. The path of Cassini as seen from Earth (the occultation track), which had been designed to cross Saturn's rings almost diametrically, has also provided two near-equatorial occultations of the atmosphere and ionosphere at longitudes separated by about 180°. During each occultation, three coherent monochromatic radio signals at wavelengths of 0.94, 3.6, and 13 cm (Ka-, X-, and S-band respectively) were transmitted through the Saturn atmosphere and ionosphere, a capability unique to Cassini. The refracted signals were received at the Earth and recorded at the NASA/JPL DSN complexes at Goldstone and Canberra. Analysis of these signals has provided the electron density profiles in the near-terminator ionosphere and the pressure - temperature profiles in the neutral atmosphere, as well as the first three-frequency measurement of microwave absorbers in Saturn's lower atmosphere.

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