HR: 1340h
AN: P43A-1010    [Abstracts]
TI: A non Thermal Model for the Titan Extended Exosphere
AU: * Garnier, P
EM: garnier@cesr.fr
AF: CESR, 9 av colonel Roche, Toulouse, 31400, France
AU: Dandouras, I
EM: dandouras@cesr.fr
AF: CESR, 9 av colonel Roche, Toulouse, 31400, France
AU: Toublanc, D
EM: toublanc@cesr.fr
AF: CESR, 9 av colonel Roche, Toulouse, 31400, France
AU: Mitchell, D G
EM: don.mitchell@jhuapl.edu
AF: APL, John Hopkins University, Laurel, MD MD, United States
AU: Roelof, E C
EM: Edmond.Roelof@jhuapl.edu
AF: APL, John Hopkins University, Laurel, MD MD, United States
AU: Brandt, P C
EM: brandpc1@jhuapl.edu
AF: APL, John Hopkins University, Laurel, MD MD, United States
AU: Krimigis, S M
EM: tom.krimigis@jhuapl.edu
AF: APL, John Hopkins University, Laurel, MD MD, United States
AU: Krupp, N
EM: krupp@linmpi.mpg.de
AF: Max Planck Insitute, Lindau, Lindau, Lindau, Germany
AU: Hamilton, D C
EM: dch@umd.edu
AF: University of Maryland, Department of Physics, University of Maryland, College Park, MD MD, United States
AU: Waite, H
EM: hunterw@umich.edu
AF: Univ. of Michigan, Department of Atmospheric, Oceanic, and Space Sciences, Univ. of Michigan, Ann Arbor, MI Ann Arbor, United States
AB: The recent results of the INMS instrument, onboard Cassini, have shown evidence for a hot Titan corona, with non thermal profiles for N2 and CH4 in the lower exosphere (below 2000 km altitude). We propose here to use these observations for modelling the extended non thermal exosphere of Titan, through the use of non thermal distributions at the exobase. Non thermal extended exospheric profiles are first deduced for the Titan flybys Ta (26th october 2004), Tb (13th december 2004) and T5 (16th april 2005). Then, we propose a non thermal exosphere model averaged over the two first two flybys, whose conditions were very similar, for the five main species at the exobase : H, H2, N, N2 and CH4. This model is then used to simulate the production of energetic neutral atoms (ENAs) in the Titan exosphere, and the results are compared to the observations of the MIMI INCA ENA imager onboard Cassini.
DE: 0328 Exosphere
DE: 2732 Magnetosphere interactions with satellites and rings
DE: 6281 Titan
SC: Planetary Sciences [P]
MN: 2007 Fall Meeting