eprintid: 1414089
rev_number: 33
eprint_status: archive
userid: 608
dir: disk0/01/41/40/89
datestamp: 2013-11-08 20:10:18
lastmod: 2021-09-19 23:39:12
status_changed: 2013-11-08 20:10:18
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Coates, AJ
creators_name: Wellbrock, A
creators_name: Jones, GH
creators_name: Waite, JH
creators_name: Schippers, P
creators_name: Thomsen, MF
creators_name: Arridge, CS
creators_name: Tokar, RL
title: Photoelectrons in the Enceladus plume
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F63
keywords: Enceladus, photoelectrons, plume, ionosphere, Saturn, magnetosphere
note: © 2013. American Geophysical Union. All Rights Reserved. Full text made available to UCL Discovery by kind permission of Wiley.
abstract: 1] The plume of Enceladus is a remarkable plasma environment containing several charged particle species. These include cold magnetospheric electrons, negative and positive water clusters, charged nanograins, and “magnetospheric photoelectrons” produced from ionization of neutrals throughout the magnetosphere near Enceladus. Here we discuss observations of a population newly identified by the Cassini Plasma Spectrometer (CAPS) electron spectrometer instrument—photoelectrons produced in the plume ionosphere itself. These were found during the E19 encounter, in the energetic particle shadow where penetrating particles are absent. Throughout E19, CAPS was oriented away from the ram direction where the clusters and nanograins are observed during other encounters. Plume photoelectrons are also clearly observed during the E9 encounter and are also seen at all other Enceladus encounters where electron spectra are available. This new population, warmer than the ambient plasma population, is distinct from, but adds to, the magnetospheric photoelectrons. Here we discuss the observations and examine the implications, including the ionization source these electrons provide.
date: 2013-08
official_url: http://dx.doi.org/10.1002/jgra.50495
vfaculties: VMPS
oa_status: green
full_text_type: pub
primo: open
primo_central: open_green
verified: verified_manual
elements_source: WoS-Lite
elements_id: 914238
doi: 10.1002/jgra.50495
lyricists_name: Coates, Andrew
lyricists_name: Jones, Geraint
lyricists_name: Wellbrock, Anne
lyricists_id: AJCOA20
lyricists_id: GHJON25
lyricists_id: AWELL44
full_text_status: public
publication: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
volume: 118
number: 8
pagerange: 5099 - 5108
issn: 2169-9380
citation:        Coates, AJ;    Wellbrock, A;    Jones, GH;    Waite, JH;    Schippers, P;    Thomsen, MF;    Arridge, CS;           Coates, AJ;  Wellbrock, A;  Jones, GH;  Waite, JH;  Schippers, P;  Thomsen, MF;  Arridge, CS;  Tokar, RL;   - view fewer <#>    (2013)    Photoelectrons in the Enceladus plume.                   JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS , 118  (8)   5099 - 5108.    10.1002/jgra.50495 <https://doi.org/10.1002/jgra.50495>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1414089/1/jgra50495.pdf