36th DPS Meeting, 8-12 November 2004
Session 2 Cassini at Saturn II
Special Session, Monday, November 8, 2004, 10:30am-12:noon, Lewis

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[2.05] Initial Cassini Plasma Observations at Saturn

D.T. Young, F.J. Crary, J.L. Burch, R. Goldstein, D.J. McComas, J.D. Furman, C. Zinsmeyer (Southwest Research Institute, San Antonio, TX), J.-J. Berthelier, J.-M. Illiano (Centre d'etude des Environnements Terrestre et Planetaires, France), M. Blanc, S. Maurice, E. Pallier (Observatoire Midi-Pyrenees, France), S. Bolton (JPL), A.J. Coates, D.R. Linder, H. McAndrews, A. Rymer (University College London), M. Grande (Rutherford Appleton Laboratory, England), T.W. Hill (Rice U.), R.E. Johnson, R.A. Baragiola, H.T. Smith (U. Virginia), V. Kelha, C. Holmlund (VTT Information Technology, Finland), K. Mursala, P. Tanskanen, J. Vilppola (U. Oulu, Finland), E.C. Sittler, D. Glen, S. Bakshi (GSFC), K.R. Svenes, B.T. Narheim (Norwegian Defense Research Establishment, Norway), K. Szego, Z. Bebesi (KFKI Research Institute for Particle and Nuclear Physics, Hungary), M.F. Thomsen, B.L. Barraclough, D. Delapp, R.L. Tokar, J. Steinberg, J.E. Nordholt (Los Alamos National Laboratory), D. Reisenfeld (U. Montana)

The Cassini Plasma Spectrometer (CAPS) measures ion energy and mass composition from 1 eV to 50 keV and electron energy from 1 eV to 28 keV. It thus fills in important gaps in earlier Voyager measurements of energy and, in particular, ion composition. We give an overview of data taken during the first two Cassini orbits, including an overflight of the rings with closest approach of 1.33 Saturn radii and a close flyby of Titan at 1250 km. Several distinct and dynamic plasma regions have been identified, in particular a co-rotating plasmasphere dominated by water group ions between 2.2 ~ 14 Saturn radii, and a cold ionosphere of oxygen ions over the rings.

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Bulletin of the American Astronomical Society, 36 #4
© 2004. The American Astronomical Soceity.