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).

Download

[img] PDF Carter_et_al-2015-Journal_of_Geophysical_Research__Space_Physics.pdf - Version of Record
Available under License Creative Commons Attribution.

Download (5MB)

Description/Abstract

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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1002/2014JA020809
ISSNs: 2169-9380 (print)
Organisations: Astronomy Group
ePrint ID: 394179
Date :
Date Event
2 March 2015Accepted/In Press
1 April 2015Published
Date Deposited: 12 May 2016 11:27
Last Modified: 17 Apr 2017 03:12
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/394179

Actions (login required)

View Item View Item