HR: 09:45h
AN: SM11A-06    [Abstracts]
TI: Variations in Ion Composition in Saturn's Magnetosphere and a Comparison with Earth and Jupiter
AU: * Hamilton, D
EM: dch@umd.edu
AF: University of Maryland, Department of Physics, College Park, MD 20742 United States
AU: Hill, M
AF: University of Maryland, Department of Physics, College Park, MD 20742 United States
AU: Krimigis, S
AF: Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723 United States
AU: Mitchell, D
AF: Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723 United States
AU: Dandouras, J
AF: Centre D'Etude Spatiale Des Rayonnements, 9 Avenue du Colonel Roche, Toulouse, 31028 France
AU: Livi, S
AF: Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723 United States
AU: Krupp, N
AF: Max Planck Institute for Solar System Research, Max-Planck-Str. 2, Katlenburg-Lindau, 37191 Germany
AU: Armstrong, T
AF: Fundamental Technologies, Inc., 2411 Ponderosa, Lawrence, KS 66046 United States
AB: The Charge-Energy-Mass Spectrometer (CHEMS), one of three sensors comprising the MIMI investigation on Cassini, measures the mass and charge state of ions in the energy per charge range 3--220 keV/e. The suprathermal ion composition determined by CHEMS has been generally consistent during the first four passes through Saturn's magnetosphere. The observed heavy ions are largely water products (O⁺, OH⁺, H₂O⁺, and O₂⁺) with a near absence of N⁺ ions. Nonetheless, both spatial and temporal variations have been observed in the heavy ion composition and in the ratio of heavy to light ions (H⁺, H₂⁺, He⁺, and He⁺⁺). We will discuss those variations and their causes and compare the average composition at Saturn with CHEMS' measurements during the flybys of Earth and Jupiter.
DE: 5737 Magnetospheres (2756)
DE: 6275 Saturn
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly