HR: 1340h
AN: P43A-0944    [Abstracts]
TI: Where has all the Nitrogen Gone?
AU: * Eviatar, A
EM: arkee1@daphne.tau.ac.il
AF: Department of Geophysics & Planetary Sciences, Tel Aviv University, Ramat Aviv, 69978 Israel
AU: Smith, H T
EM: hts@cms.mail.virginia.edu
AF: Department of Engineering Physics, University of Virginia, Charlottesville, VA 22901 United States
AU: Johnson, R E
EM: rej@virginia.edu
AF: Department of Engineering Physics, University of Virginia, Charlottesville, VA 22901 United States
AU: Goldstein, R
EM: rgoldstein@swri.edu
AF: Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78228 United States
AU: Young, D T
EM: dyoung@swri.edu
AF: Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78228 United States
AU: Sittler, E C
EM: EdwardCSittler@nasa.gov
AF: Goddard Space Flight Center , 8800 Greenbelt Road Greenbelt Road , Greenbelt, MD 20771 United States
AB: The kronian satellite Titan possesses a high density atmosphere consisting primarily of molecular nitrogen. It has been, for decades, the general expectation that there should be a torus of neutral and ionized nitrogen associated with Titan and a considerable body of literature on the nature of this putative nitrogen atmosphere exists. Hot pickup nitrogen ions would not have been observable by means of the PLS instrument on Voyager, but the cases of cold ions that were detected outside the main plasma body of Saturn exhibited a degree of statistical preference for identification as water group ions. The CAPS experiment on Cassini which has mass identification capability has found that the plasma existing in the volume of space expected to contain the anticipated N⁺ torus is dominated by water group components. In this study we consider the modes of escape of nitrogen from Saturn and the loss mechanisms that appear to preclude the formation of the dense plasma and neutral torus that had been anticipated in the wake of the Voyager findings. We also evaluate the extent to which Titan might constitute as minor contributor to the nitrogen ion that has been observed by CAPS in the domain of the inner icy satellites.
DE: 6280 Saturnian satellites
DE: 6281 Titan
SC: Planetary Sciences [P]
MN: Fall Meeting 2005