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Transpolar arcs observed simultaneously in both hemispheres

Carter, J.A., Milan, S.E. and Fear, R.C. (2017) Transpolar arcs observed simultaneously in both hemispheres Journal of Geophysical Research: Space Physics, 122, (6), pp. 6107-6120. (doi:10.1002/2016JA023830).

Record type: Article


Two coexisting transpolar arcs are observed on 31 August 2005. We track the formation and motion of the arcs in both the Northern and Southern Hemispheres, using data from two independent satellites (Imager for Magnetopause to Aurora Global Exploration and a Defence Meteorological Satellite Program satellite). The observations are supported by supplementary ground-based ionospheric convection data from the Super Dual Auroral Radar Network. The two arcs form during a period of northward interplanetary magnetic field. Following a change in the direction of the interplanetary magnetic field BY component from negative to positive, the dawnside arc traverses the polar cap to the duskside in the Northern Hemisphere. Over the same time period and in the Southern Hemisphere, the duskside arc traverses the polar cap to the dawnside. A complex magnetic field line topology resulting in the coexistence of two tongues of closed field lines protruding into the otherwise open polar cap is implied. We discuss these observations in terms of magnetic conjugacy and a model of transpolar arcs formation.

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Accepted/In Press date: 16 May 2017
e-pub ahead of print date: 13 June 2017
Published date: June 2017


Local EPrints ID: 413970
ISSN: 21699380
PURE UUID: 0cccb230-3550-404d-8830-131ea23cb1ae
ORCID for R.C. Fear: ORCID iD

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Date deposited: 12 Sep 2017 16:31
Last modified: 12 Sep 2017 16:31

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Author: J.A. Carter
Author: S.E. Milan
Author: R.C. Fear ORCID iD

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