28 May 2017 to 2 June 2017
Queen's University
America/Toronto timezone
Welcome to the 2017 CAP Congress! / Bienvenue au congrès de l'ACP 2017!

POS-18 - An e-POP multi-instrument study of a stable double-arc

31 May 2017, 18:06
2m
Queen's Athletics & Recreation Centre (ARC)

Queen's Athletics & Recreation Centre (ARC)

Poster (Non-Student) / affiche (non-étudiant) Atmospheric and Space Physics / Physique atmosphérique et de l'espace (DASP-DPAE) DASP Poster Session | Session d'affiches DPAE (3)

Speaker

Dr Gordon James (University of Calgary)

Description

We report the findings of a case study in which in the Enhanced Polar Outflow Probe (e-POP) passed over a stable double-arc system in the pre-midnight sector. The arcs’ near infrared emissions were identified using e-POP’s Fast Auroral Imager (FAI). We have assimilated measurements from e-POP’s highly-resolved contemporaneous dataset in order to provide new and compelling insight into the microphysics of dynamic magnetosphere-ionosphere coupling processes. As e-POP crossed the arc, its magnetic footprint remained within the FAI’s field-of-view, allowing for the interconnection of the optical, plasma, and electromagnetic properties of the arc to be studied in detail. e-POP’s MaGnetic Field instrument (MGF) measured magnetic field perturbations indicative of structures of field-aligned currents collocated with the optical signature of the arc. The Radio Receiver Instrument (RRI) data exhibits a highly structured VLF spectrum and shows that a prominent VLF hiss structure was generated by the arc. Measurements from e-POP’s Imaging and Rapid-Scanning Mass Spectrometer (IRM) show that, in the vicinity of the arc, the ionosphere was dominated by vertically upward plasma flows, and that the flows did not show any significant structuring at the location of the arc. However, approximately 75 km poleward of the arc in a region that was devoid of optical emissions, an ion-energization event was detected by both the IRM and Suprathermal Electron Imager (SEI). The energization is supported Ultra Low Frequency (ULF) radio wave activity as detected by the Radio Receiver Instrument (RRI).

Primary authors

Dr Gareth Perry (University of Calgary) Dr Gordon James (University of Calgary) Andrew Howarth (University of Calgary) Dr David Miles (University of Alberta) Mr Yangyang Shen (University of Calgary) Dr Leroy Cogger (University of Calgary) Dr David Knudsen (University of Calgary) Dr Andrew Yau (University of Calgary)

Presentation materials

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