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    Cassini CAPS-ELS observations of negative ions in Titan's ionosphere: trends of density with altitude

    Wellbrock, Anne and Coates, Andrew J. and Jones, Geraint H. and Lewis, Gethyn R. and Waite, J.H. (2013) Cassini CAPS-ELS observations of negative ions in Titan's ionosphere: trends of density with altitude. Geophysical Research Letters 40 (17), pp. 4481-4485. ISSN 0094-8276.

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    Abstract

    Observations with the Electron Spectrometer sensor of the Cassini Plasma Spectrometer (CAPS-ELS) have revealed the existence of negative ions in Titan's ionosphere. Negative ions are observed during encounters whenever the instrument points in the ram direction at altitudes 950–1400 km. Complex hydrocarbon and nitrile chemical processes are believed to take place which play a role in haze formation. The heaviest ions observed so far have masses up to 13,800 amu/q. Using data from 34 Titan encounters, we show for the first time negative ion density trends of different mass groups, including total densities, with altitude. We determine peak densities and the associated altitudes at which they are observed and the highest altitudes at which individual mass groups are found.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Titan, ionosphere, aerosol, negative ions, atmosphere, electron attachment
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences > UCL/Birkbeck Centre for Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 06 Sep 2013 08:43
    Last Modified: 25 Jun 2020 20:03
    URI: http://eprints.bbk.ac.uk/id/eprint/8088

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