A Summary of Cassini Radio Science Observations of the Ionosphere and Atmosphere of Saturn

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In 2005, 13 radio occultation observations or the near-equatorial ionosphere of Saturn were conducted with the Cassini spacecraft (Nagy, et al., JGR, 2006). Beginning in2006, 20 more observations at diverse latitudes have been obtained on orbits 28(5oS, 56oS), 44 (75oN, 5oN), 46 (5oS ), 47 (51oS ), 51 ( 41oS, 39oS ), 54 (18oS, 68oS ), 56 (18oS, 70oS ), 58(75oS), 68(22oN,58oS), 70(37oN,68oS), 72(35oN,62oS), 73(62oS), and 75(29oN,57oS). These occultations provided data on the structure of the ionosphere and atmosphere at mid- and high latitudes, away from the influence of the rings. As expected, the vertical extent of the ionosphere at higher latitudes is much greater, reaching 10,000 km above the 1 bar level. However, at similar latitudes, influences other than dawn or dusk situation appears to be dominant. In the neutral atmosphere, observations of the Temperature-pressure profiles, and absorptivity at S-band (13.5 cm), X-band ( 3.7 cm), and Ka-band ( 1 cm) wavelengths were also obtained, enabling their variability with latitude to be determined.

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