Preliminary Interpretation of Titan Plasma Interaction as Observed by the Cassini Plasma Spectrometer: Comparisons With Voyager 1

Details Preliminary Interpretation of Titan Plasma Interaction as Observed by the Cassini Plasma Spectrometer: Comparisons With Voyager 1 Preliminary Interpretation of Titan Plasma Interaction as Observed by the Cassini Plasma Spectrometer: Comparisons With Voyager 1

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p53a1453h&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P53A-1453

Physics

7807 Charged Particle Motion And Acceleration, 6026 Ionospheres: Composition And Chemistry, 6028 Ionospheres: Structure And Dynamics, 6280 Saturnian Satellites, 2459 Planetary Ionospheres (5435, 5729, 6026, 6027, 6028)

Scientific paper

The Cassini Plasma Spectrometer (CAPS) instrument is scheduled to observe the plasma environment at Titan October 26, 2004 from the Cassini Orbiter. Preliminary CAPS ion measurements from this encounter (1, 2) will be compared with measurements made by the Voyager I Plasma Science Instrument (PLS). The comparison will be used to evaluate previous interpretations and predictions of the Titan plasma environment that have been made using PLS measurements (3, 4). The comparisons will focus on the composition and nature of the ambient plasma and pickup ions. Using the CAPS ion measurements, some of the questions to be addressed, as stimulated by the previous interpretations and predictions made evaluating PLS data, are the following: A) Are H+ and N+ the major ion components of Saturn's rotating magnetosphere in the vicinity of Titan? B) Are finite gyroradius effects apparent in ambient N+ as the result of its interaction with Titan's atmosphere? C) Are the principal pickup ions composed of H+, H2+, N+, N2+ and CH4+?, D) Is there evidence of slowing down of the ambient plasma due to pickup ion mass loading and as the ionopause is approached are heavier pickup ions becoming dominant such as N2+? During the Voyager I flyby, Titan was in Saturn's magnetosphere. If Titan is in Saturn's magnetosheath or the solar wind at the encounter, questions similar to the above will be addressed as appropriate. 1. Young et al., this issue, Fall AGU session, 2004. 2. Coates, et al., this issue, Fall AGU session, 2004 3. Hartle et al., J. Geophys. Res., 87, 1383, 1982. 4. Sittler et al., Titan Symposium Proceedings, ESTEC, Editor, Jean-Pierre Lebreton, 2004.

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