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The observed composition of ions outflowing from Titan

by Smith, H. T. , Westlake, J. H. , Mandt, K. E. , Waite Jr, J. H. , Paranicas, C. P. , Mitchell, D. G. , Perry, M. E. , Luhmann, J. G. , Cravens, T. E. , Rymer, A. M. , Wahlund, J.-E.

in Atmospheric sciences / Cassini / dynamics / Earth sciences / Earth, ocean, space / Exact sciences and technology / flyby / hybrid simulation / Ionosphere / Ions / Magnetism / Moons / outflow / Planetology / Planets / plasma environment / Saturn / saturns magnetosphere / Titan / voyager-1

2012

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The observed composition of ions outflowing from Titan

by Smith, H. T. , Westlake, J. H. , Mandt, K. E. , Waite Jr, J. H. , Paranicas, C. P. , Mitchell, D. G. , Perry, M. E. , Luhmann, J. G. , Cravens, T. E. , Rymer, A. M. , Wahlund, J.-E.

2012

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The observed composition of ions outflowing from Titan

by Smith, H. T. , Westlake, J. H. , Mandt, K. E. , Waite Jr, J. H. , Paranicas, C. P. , Mitchell, D. G. , Perry, M. E. , Luhmann, J. G. , Cravens, T. E. , Rymer, A. M. , Wahlund, J.-E.

2012

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Journal Article

The observed composition of ions outflowing from Titan

Smith, H. T.,

Westlake, J. H.,

Mandt, K. E.,

Waite Jr, J. H.,

Paranicas, C. P.,

Mitchell, D. G.,

Perry, M. E.,

Luhmann, J. G.,

Cravens, T. E.,

Rymer, A. M.,

Wahlund, J.-E.

2012

Overview

We report on Cassini Ion and Neutral Mass Spectrometer (INMS) observations above Titan's exobase at altitudes of 2225 km to 3034 km. We observe significant densities of CH5+, HCNH+ and C2H5+that require ion‐molecule reactions to be produced in the quantities observed. The measured composition and ion velocity (about 0.8–1.5 km/s) suggest that the observed ions must have been created deep inside Titan's ionosphere (below the exobase) and then transported to the detection altitude. Plasma motion from below Titan's exobase to large distances can be driven by a combination of thermal pressure and magnetic forces. The observed outward flows may link the main ionosphere with the more distant wake and provide a source of hydrocarbon ions in the Saturnian system. Key Points The Cassini INMS observes ions from below Titan's exobase near 3000 km altitude The composition is ionospheric, namely CH3+, CH4+, CH5+, HCNH+, and C2H5+ The ions are observed to have a speed of 0.8‐1.5 km/s relative to Titan

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Publisher

Blackwell Publishing Ltd,American Geophysical Union,John Wiley & Sons, Inc

Subject

Atmospheric sciences

/ Cassini

/ dynamics

/ Earth sciences

/ Earth, ocean, space

/ Exact sciences and technology

/ flyby