Composition of Titan's ionosphere

We present Cassini Ion and Neutral Mass Spectrometer (INMS) measurements of ion densities on the nightside of Titan from April 16, 2005, and show that a substantial ionosphere exists on the nightside and that complex ion chemistry is operating there. The total ionospheric densities measured both by...

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Veröffentlicht in:Geophysical research letters 2006-04, Vol.33 (7), p.n/a
Hauptverfasser: Cravens, T. E., Robertson, I. P., Waite Jr, J. H., Yelle, R. V., Kasprzak, W. T., Keller, C. N., Ledvina, S. A., Niemann, H. B., Luhmann, J. G., McNutt, R. L., Ip, W.-H., De La Haye, V., Mueller-Wodarg, I., Wahlund, J.-E., Anicich, V. G., Vuitton, V.
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container_issue 7
container_start_page
container_title Geophysical research letters
container_volume 33
creator Cravens, T. E.
Robertson, I. P.
Waite Jr, J. H.
Yelle, R. V.
Kasprzak, W. T.
Keller, C. N.
Ledvina, S. A.
Niemann, H. B.
Luhmann, J. G.
McNutt, R. L.
Ip, W.-H.
De La Haye, V.
Mueller-Wodarg, I.
Wahlund, J.-E.
Anicich, V. G.
Vuitton, V.
description We present Cassini Ion and Neutral Mass Spectrometer (INMS) measurements of ion densities on the nightside of Titan from April 16, 2005, and show that a substantial ionosphere exists on the nightside and that complex ion chemistry is operating there. The total ionospheric densities measured both by the INMS and the Cassini Radio and Plasma Wave (RPWS) experiments on Cassini suggest that precipitation from the magnetosphere into the atmosphere of electrons with energies ranging from 25 eV up to about 2 keV is taking place. The absence of ionospheric composition measurements has been a major obstacle to understanding the ionosphere. Seven “families” of ion species, separated in mass‐to‐charge ratio by 12 Daltons (i.e., the mass of carbon), were observed and establish the importance of hydrocarbon and nitrile chains in the upper atmosphere. Several of the ion species measured by the INMS were predicted by models (e.g., HCNH+ and C2H5+). But the INMS also saw high densities at mass numbers not predicted by models, including mass 18, which we suggest will be ammonium ions (NH4+) produced by reaction of other ion species with neutral ammonia.
doi_str_mv 10.1029/2005GL025575
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source Wiley Online Library Free Content; Access via Wiley Online Library; Wiley-Blackwell AGU Digital Library; EZB-FREE-00999 freely available EZB journals
subjects Earth sciences
Earth, ocean, space
Exact sciences and technology
title Composition of Titan's ionosphere
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