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Dayside reconnection under interplanetary magnetic field By-dominated conditions: The formation and movement of bending arcs

Carter, J.A., Milan, S.E., Fear, R.C., Kullen, A. and Hairston, M.R. (2015) Dayside reconnection under interplanetary magnetic field By-dominated conditions: The formation and movement of bending arcs Journal of Geophysical Research: Space Physics, 120, (4), pp. 2967-2978. (doi:10.1002/2014JA020809).

Record type: Article


Based upon a survey of global auroral images collected by the Polar Ultraviolet Imager, Kullen et?al. (2002) subdivided polar cap auroral arcs into a number of categories, including that of “bending” arcs. We are concerned with those bending arcs that appear as a bifurcation of the dayside auroral oval and which subsequently form a spur intruding into the polar cap. Once formed, the spur moves poleward and antisunward over the lifetime of the arc. We propose that dayside bending arcs are ionospheric signatures of pulses of dayside reconnection and are therefore part of a group of transient phenomena associated with flux transfer events. We observe the formation and subsequent motion of a bending arc across the polar cap during a 30 min interval on 8 January 1999, and we show that this example is consistent with the proposed model. We quantify the motion of the arc and find it to be commensurate with the convection flows observed by both ground-based radar observations and space-based particle flow measurements. In addition, precipitating particles coincident with the arc appear to occur along open field lines, lending further support to the model.

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Accepted/In Press date: 2 March 2015
Published date: 1 April 2015
Organisations: Astronomy Group


Local EPrints ID: 394179
ISSN: 2169-9380
PURE UUID: 31a61928-d5ce-4bde-b868-82b368abbe66
ORCID for R.C. Fear: ORCID iD

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Date deposited: 12 May 2016 11:27
Last modified: 17 Jul 2017 19:02

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

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