HR: 15:30h
AN: P34A-01    [Abstracts]
TI: The Vertical Structure of Titan's Upper Atmosphere
AU: * Yelle, R
EM: yelle@lpl.arizona.edu
AF: University of Arizona, 1629 E. Univeristy Blvd, Tuson, AZ 85721 United States
AU: Borggren, N
EM:
AF: University of Arizona, 1629 E. Univeristy Blvd, Tuson, AZ 85721 United States
AU: de la Haye, V
EM:
AF: University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109 United States
AU: Waite, H
EM:
AF: University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109 United States
AU: Mueller-Wodarg, I
EM:
AF: Imperial College, Blackett Labratory Prince Consort Road, London, AZ SW7 2BW United Kingdom
AU: Kasprzak, W
EM:
AF: NASA Goddard Space Flight Center, Planetary Systems Branch Mail Code 693, Greenbelt, MD 20771 United States
AU: Niemann, H
EM:
AF: NASA Goddard Space Flight Center, Planetary Systems Branch Mail Code 693, Greenbelt, MD 20771 United States
AB: We present the analysis of data acquired by the Cassini Ion Neutral Mass Spectrometer (INMS) during the close flyby of Titan on 26 October (TA) and to be acquired during the close flyby on 15 April 2005 (T5). Closest approach to Titan for TA occurred at an altitude of 1174 km, a latitude of 38.6 degrees and a local time of 16.75 hours, i.e. quite close to the terminator. Closest approach for T5 is planned to occur at an altitude of 1025 km, a latitude of 74 degrees, and a local time of 23 hours, i.e. close to midnight. The data from TA indicate that the upper atmosphere is isothermal at a temperature of 148 K, the eddy diffusion coefficient is 5E9 cm²s^-1, and the H2 escape flux is 6E9 cm^-2s^-1, referred to the surface. A similar analysis will be presented for T5 data.
DE: 5704 Atmospheres--composition and chemistry
DE: 5707 Atmospheres--structure and dynamics
DE: 5709 Composition
DE: 5719 Interactions with particles and fields
SC: Planetary Sciences [P]
MN: 2005 Joint Assembly