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Modeling, Analysis, and Interpretation of Photoelectron Energy Spectra at Enceladus Observed by Cassini

Taylor, SA; Coates, AJ; Jones, GH; Wellbrock, A; Fazakerley, AN; Desai, RT; Caro-Carretero, R; ... Waite, JH; + view all (2018) Modeling, Analysis, and Interpretation of Photoelectron Energy Spectra at Enceladus Observed by Cassini. Journal of Geophysical Research: Space Physics , 123 (1) pp. 287-296. 10.1002/2017JA024536. Green open access

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Abstract

The Electron Spectrometer (ELS) of the Cassini Plasma Spectrometer has observed photoelectrons produced in the plume of Enceladus. These photoelectrons are observed during Enceladus encounters in the energetic particle shadow where the spacecraft is largely shielded from penetrating radiation by the moon. We present a complex electron spectrum at Enceladus including evidence of two previously unidentified electron populations at 6-10 eV and 10-16 eV. We estimate that the proportion of "hot" ( > 15 eV) to "cold" ( < 15 eV) electrons during the Enceladus flybys is ≈ 0.1-0.5%. We have constructed a model of photoelectron production in the plume and compared it with ELS Enceladus flyby data by scaling and energy shifting according to spacecraft potential. We suggest that the complex structure of the electron spectrum observed can be explained entirely by photoelectron production in the plume ionosphere.

Type: Article
Title: Modeling, Analysis, and Interpretation of Photoelectron Energy Spectra at Enceladus Observed by Cassini
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/2017JA024536
Publisher version: http://doi.org/10.1002/2017JA024536
Language: English
Additional information: © 2018. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: Photoelectrons; Enceladus; Saturn
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/10042676
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