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Fast and Slow Water Ion Populations in the Enceladus Plume

Haythornthwaite, R; Coates, A; Jones, G; Waite, JH; (2020) Fast and Slow Water Ion Populations in the Enceladus Plume. Journal of Geophysical Research: Space Physics , 125 (2) , Article e2019JA027591. 10.1029/2019JA027591. Green open access

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Abstract

Ion velocities have been measured during the Enceladus E3 and E5 flybys using the Cassini Plasma Spectrometer (CAPS) instrument on the Cassini spacecraft. Data from three sensors in the CAPS instrument have been examined from two flybys that occurred during 2008. Positive ion measurements from the CAPS Ion Beam Spectrometer and Ion Mass Spectrometer have been used to measure positive ion velocities. The CAPS Electron Spectrometer has been used to complement the positive ion findings with measurements of negative ion velocities. Two velocities for the positive ions are found, with the fast ions (2.3–5.8 km/s) originating from the high‐speed neutral gas emission and slow ions (0.2–2.2 km/s) associated with the low‐speed thermal gas emission from Enceladus. Negative ions were found to be near stationary or northerly traveling, implying a deceleration mechanism within the plume. A tentative detection of fast negative ions was also recorded for one of the flybys. These findings will aid in future modeling of plume dynamics.

Type: Article
Title: Fast and Slow Water Ion Populations in the Enceladus Plume
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2019JA027591
Publisher version: https://doi.org/10.1029/2019JA027591
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Enceladus, Cassini, ions, plume, jets, CAPS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10092044
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