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Science 13 May 2005:
Vol. 308. no. 5724, pp. 989 - 992
DOI: 10.1126/science.1109805
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Reports

Energetic Neutral Atom Emissions from Titan Interaction with Saturn's Magnetosphere

D. G. Mitchell,1* P. C. Brandt,1 E. C. Roelof,1 J. Dandouras,2 S. M. Krimigis,1 B. H. Mauk1

The Cassini Magnetospheric Imaging Instrument (MIMI) observed the interaction of Saturn's largest moon, Titan, with Saturn's magnetosphere during two close flybys of Titan on 26 October and 13 December 2004. The MIMI Ion and Neutral Camera (INCA) continuously imaged the energetic neutral atoms (ENAs) generated by charge exchange reactions between the energetic, singly ionized trapped magnetospheric ions and the outer atmosphere, or exosphere, of Titan. The images reveal a halo of variable ENA emission about Titan's nearly collisionless outer atmosphere that fades at larger distances as the exospheric density decays exponentially. The altitude of the emissions varies, and they are not symmetrical about the moon, reflecting the complexity of the interactions between Titan's upper atmosphere and Saturn's space environment.

1 Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 21042, USA.
2 Centre D'Etude Spatiale Des Rayonnements, 31028 Toulouse, France.

* To whom correspondence should be addressed. E-mail: don.mitchell{at}jhuapl.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Titan's exosphere and its interaction with Saturn's magnetosphere.
I. Dandouras, P. Garnier, D. G Mitchell, E. C Roelof, P. C Brandt, N. Krupp, and S. M Krimigis (2009)
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Interaction of Titan's ionosphere with Saturn's magnetosphere.
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Intensive Titan Exploration Begins.
P. R. Mahaffy (2005)
Science 308, 969-970
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