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Variability of dayside convection and motions of the cusp/cleft aurora

Lockwood, M; Moen, J; Cowley, SWH; Farmer, AD; Løvhaug, UP; Lühr, H; Davda, VN; (1993) Variability of dayside convection and motions of the cusp/cleft aurora. Geophysical Research Letters , 20 (11) 1011 - 1014. 10.1029/93GL00846. Green open access

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Abstract

We present measurements of the ionospheric plasma flow over the range of invariant latitudes 71-76-degrees, observed at 10-second resolution using both the EISCAT radars, with simultaneous observations of the 630 nm cusp/cleft aurora made by a meridian-scanning photometer at Ny Alesund, Svalbard. A major increase in the trans-auroral voltage from 5 to 40 kV (associated with sunward convection in the early afternoon sector) is found to follow a southward motion of the aurora and coincide with the onset of regular transient auroral breakup events. It is shown that these observations are consistent with recent theoretical work on how ionospheric flows are excited by time-dependent reconnection at the dayside magnetopause.

Type: Article
Title: Variability of dayside convection and motions of the cusp/cleft aurora
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/93GL00846
Publisher version: http://dx.doi.org/10.1029/93GL00846
Language: English
Additional information: Copyright 1993 by the American Geophysical Union
Keywords: Interplanetary magnetic-field, North-south component, Polar cusp, Latitude, Dependence, Time, IMF
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/104046
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