HR: 0800h
AN: P11C-0126    [Abstracts]
TI: Cassini-Huygens Ion Neutral Mass Spectrometer: Early Saturn and Titan Results
AU: * Waite, J H
EM: hunterw@umich.edu
AF: University of Michigan, Atmospheric, Oceanic, and Space Sciences 2455 Hayward St., Ann Arbor, MI 48109-2143 United States
AU: Cravens, T E
EM: cravens@ku.edu
AF: University of Kansas, Dept. of Physics and Astronomy 1251 Wescoe Hall, Lawrence, KS 66045-7582 United States
AU: Ip, W
EM: wingip@astro.ncu.edu.tw
AF: National Central University, Institute of Astronomy, Chung-Li, 320 Taiwan
AU: Kasprzak, W T
EM: kasprzak@nasa.gov
AF: NASA Goddard Space Flight Center, MC915, Greenbelt, MD 20771-0001 United States
AU: Luhmann, J G
EM: jgluhman@ssl.berkeley.edu
AF: University of California, Berkeley, Space Sciences Lab, Berkeley, CA 94720 United States
AU: McNutt, R L
EM: ralph.mcnutt@jhuapl.edu
AF: Johns Hopkins University, Applied Physics Lab 11100 Johns Hopkins Rd, Laurel, MD 20723-4638 United States
AU: Niemann, H B
EM: hasso.b.niemann@nasa.gov
AF: NASA Goddard Space Flight Center, MC915, Greenbelt, MD 20771-0001 United States
AU: Yelle, R
EM: yelle@lpl.arizona.edu
AF: University of Arizona, Lunar and Planetary Lab 1629 E. University Blvd., Tucson, AZ 85721-0092 United States
AU: Mueller-Wodarg, I C
EM: i.mueller-wodarg@imperial.ac.uk
AF: Imperial College, Space and Atmospheric Physics Group, London, SW7 2BW United Kingdom
AU: Ledvina, S A
EM: ledvina@ssl.berkeley.edu
AF: University of California, Berkeley, Space Sciences Lab, Berkeley, CA 94720 United States
AU: De La Haye, V
EM: vdelah@umich.edu
AF: University of Michigan, Atmospheric, Oceanic, and Space Sciences 2455 Hayward St., Ann Arbor, MI 48109-2143 United States
AB: Early ion and neutral composition results from the ring atmosphere/ionosphere, the upper atmosphere of Titan, and from the Enceladus plume/coma will be presented. The ring composition data indicate that O_2⁺ is the dominant ion in the ring ionosphere. This indicates that the formation of oxygen-rich atmospheres in ice-rich environments such as Europa and Ganymede may be more prevalent than previously anticipated. Implications for mechanisms that may be operative will be discussed. The mass spectrometer data from the first seven Titan flybys will be presented as well. This data shows a high degree of atmospheric variability and complex compositional structure. These attributes will be compared to past modeling studies to understand the nature of the major processes. Rich new data on the composition and structure of the gaseous coma surrounding Enceladus will also be presented along with the implications for evolution of the Saturn system.
DE: 2419 Ion chemistry and composition (0335)
SC: Planetary Sciences [P]
MN: Fall Meeting 2005