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Comprehensive ground-based and in situ observations of substorm expansion phase onset

Walsh, AP; Rae, IJ; Fazakerley, AN; Murphy, KR; Mann, IR; Watt, CEJ; Volwerk, M; ... Zhang, TL; + view all (2010) Comprehensive ground-based and in situ observations of substorm expansion phase onset. J GEOPHYS RES-SPACE , 115 , Article A00I13. 10.1029/2010JA015748. Green open access

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Abstract

In this paper, we present comprehensive ground-based and space-based in situ geosynchronous observations of a substorm expansion phase onset on 1 October 2005. The Double Star TC-2 and GOES-12 spacecraft were both located within the substorm current wedge during the substorm expansion phase onset, which occurred over the Canadian sector. We find that an onset of ULF waves in space was observed after onset on the ground by extending the AWESOME timing algorithm into space. Furthermore, a population of low-energy field-aligned electrons was detected by the TC-2 PEACE instrument contemporaneous with the ULF waves in space. These electrons appear to be associated with an enhancement of field-aligned Poynting flux into the ionosphere which is large enough to power visible auroral displays. The observations are most consistent with a near-Earth initiation of substorm expansion phase onset, such as the Near-Geosynchronous Onset (NGO) substorm scenario. A lack of data from further downtail, however, means other mechanisms cannot be ruled out.

Type: Article
Title: Comprehensive ground-based and in situ observations of substorm expansion phase onset
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2010JA015748
Publisher version: http://dx.doi.org/10.1029/2010JA015748
Language: English
Keywords: DOUBLE-STAR, PLASMA SHEET, MAGNETIC PULSATIONS, AURORAL SUBSTORM, IMAGE SPACECRAFT, PI2 PULSATIONS, CLUSTER, BOUNDARY, ELECTRON, MISSION
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/1302974
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