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Detection of negative ions in the deep ionosphere of TItan during the Cassini flyby T70
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Space Plasma Physics.
2012 (English)In: European Planetary Science Congress 2012, held 23-28 September, 2012 in Madrid, Spain. http://meetings.copernicus.org/epsc2012, id. EPSC2012-728, 2012Conference paper (Refereed)
Abstract [en]

We present radio and plasma wave science (RPWS) Langmuir probe (LP) observations that give evidence for a population of heavy, negative ions at altitudes below 900 km in Titan’s ionosphere during the Cassini T70 flyby. The negative ion density in this region is comparable to, or higher than, the electron density of 760 cm-\shy-3. Both positive and negative ions are moving with a velocity of at least a few hundred m s-\shy-1 relative to Titan. We show two limiting cases where we have analysed RPWS/LP ion measurements. The data can be interpreted as either that a population of negative ions with density comparable to the electron density is present, moving at a very high (\gt2 km s-\shy-1) velocity, or that the ion population is moving at a few hundred m s-\shy-1, but with a density an order of magnitude larger than the electron density in the same region.

Place, publisher, year, edition, pages
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Fusion, Plasma and Space Physics
URN: urn:nbn:se:uu:diva-196700OAI: oai:DiVA.org:uu-196700DiVA: diva2:610828
European Planetary Science Congress 2012
Available from: 2013-03-13 Created: 2013-03-13 Last updated: 2013-03-13

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