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Increasing Positive Ion Number Densities Below the Peak of Ion-Electron Pair Production in Titan's Ionosphere
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 786, no 1, 69- p.Article in journal (Refereed) Published
Abstract [en]

We combine derived ion-electron pair formation rates with Cassini Radio Plasma Wave Science Langmuir Probe measurements of electron and positive ion number densities in Titan's sunlit ionosphere. We show that positive ion number densities in Titan's sunlit ionosphere can increase toward significantly lower altitudes than the peak of ion-electron pair formation despite that the effective ion-electron recombination coefficient increases. This is explained by the increased mixing ratios of negative ions, which are formed by electron attachment to neutrals. While such a process acts as a sink for free electrons, the positive ions become longer-lived as the rate coefficients for ion-anion neutralization reactions are smaller than those for ion-electron dissociative recombination reactions.

Place, publisher, year, edition, pages
2014. Vol. 786, no 1, 69- p.
Keyword [en]
molecular processes, planets and satellites: individual (Titan)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-227261DOI: 10.1088/0004-637X/786/1/69ISI: 000335810700069OAI: oai:DiVA.org:uu-227261DiVA: diva2:731736
Available from: 2014-07-02 Created: 2014-06-24 Last updated: 2017-12-05Bibliographically approved

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Shebanits, OlegWahlund, Jan-Erik

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