eprintid: 1452135 rev_number: 39 eprint_status: archive userid: 608 dir: disk0/01/45/21/35 datestamp: 2014-10-20 20:07:30 lastmod: 2021-09-19 23:38:59 status_changed: 2014-10-20 20:07:30 type: article metadata_visibility: show item_issues_count: 0 creators_name: Nordheim, TA creators_name: Jones, GH creators_name: Roussos, E creators_name: Leisner, JS creators_name: Coates, AJ creators_name: Kurth, WS creators_name: Khurana, KK creators_name: Krupp, N creators_name: Dougherty, MK creators_name: Waite, JH title: Detection of a strongly negative surface potential at Saturn's moon Hyperion ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F63 keywords: Saturn's moons, surface charging, Cassini, Hyperion note: ©2014. 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. abstract: On 26 September 2005, Cassini conducted its only close targeted flyby of Saturn's small, irregularly shaped moon Hyperion. Approximately 6 min before the closest approach, the electron spectrometer (ELS), part of the Cassini Plasma Spectrometer (CAPS) detected a field-aligned electron population originating from the direction of the moon's surface. Plasma wave activity detected by the Radio and Plasma Wave instrument suggests electron beam activity. A dropout in energetic electrons was observed by both CAPS-ELS and the Magnetospheric Imaging Instrument Low-Energy Magnetospheric Measurement System, indicating that the moon and the spacecraft were magnetically connected when the field-aligned electron population was observed. We show that this constitutes a remote detection of a strongly negative (~ −200 V) surface potential on Hyperion, consistent with the predicted surface potential in regions near the solar terminator. date: 2014-10-28 official_url: http://dx.doi.org/10.1002/2014GL061127 vfaculties: VMPS oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_source: WoS-Lite elements_id: 986127 doi: 10.1002/2014GL061127 lyricists_name: Coates, Andrew lyricists_name: Jones, Geraint lyricists_id: AJCOA20 lyricists_id: GHJON25 full_text_status: public publication: GEOPHYSICAL RESEARCH LETTERS volume: 41 number: 20 pagerange: 7011 - 7018 issn: 0094-8276 citation: Nordheim, TA; Jones, GH; Roussos, E; Leisner, JS; Coates, AJ; Kurth, WS; Khurana, KK; ... Waite, JH; + view all <#> Nordheim, TA; Jones, GH; Roussos, E; Leisner, JS; Coates, AJ; Kurth, WS; Khurana, KK; Krupp, N; Dougherty, MK; Waite, JH; - view fewer <#> (2014) Detection of a strongly negative surface potential at Saturn's moon Hyperion. GEOPHYSICAL RESEARCH LETTERS , 41 (20) 7011 - 7018. 10.1002/2014GL061127 <https://doi.org/10.1002/2014GL061127>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1452135/1/grl52129.pdf