Transpolar arcs observed simultaneously in both hemispheres
Transpolar arcs observed simultaneously in both hemispheres
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.
6107-6120
Carter, J.A.
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Milan, S.E.
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Fear, R.C.
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Walach, M.-T.
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Harrison, Z.A.
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Paxton, L.J.
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Hubert, B.
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June 2017
Carter, J.A.
750f3f36-98fc-4729-acfe-60ded2bd23c1
Milan, S.E.
4495fdee-b600-43e5-99f7-6193a849b7f5
Fear, R.C.
8755b9ed-c7dc-4cbb-ac9b-56235a0431ab
Walach, M.-T.
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Harrison, Z.A.
73c5b0e4-ed62-453f-800d-5147b300a18f
Paxton, L.J.
5aa386de-58fd-4509-a13f-7ba9cb041b83
Hubert, B.
0472a694-50b8-4bed-8f30-8c5fcbbd58dc
Carter, J.A., Milan, S.E., Fear, R.C., Walach, M.-T., Harrison, Z.A., Paxton, L.J. and Hubert, B.
(2017)
Transpolar arcs observed simultaneously in both hemispheres.
Journal of Geophysical Research: Space Physics, 122 (6), .
(doi:10.1002/2016JA023830).
Abstract
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.
Text
Carter_et_al-2017-Journal_of_Geophysical_Research__Space_Physics
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Accepted/In Press date: 16 May 2017
e-pub ahead of print date: 13 June 2017
Published date: June 2017
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Local EPrints ID: 413970
URI: http://eprints.soton.ac.uk/id/eprint/413970
ISSN: 2169-9402
PURE UUID: 0cccb230-3550-404d-8830-131ea23cb1ae
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Date deposited: 12 Sep 2017 16:31
Last modified: 16 Mar 2024 04:18
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Contributors
Author:
J.A. Carter
Author:
S.E. Milan
Author:
M.-T. Walach
Author:
Z.A. Harrison
Author:
L.J. Paxton
Author:
B. Hubert
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