Physics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996angeo..14.1257f&link_type=abstract
Annales Geophysicae, vol. 14, Issue 12, pp.1257-1264
Physics
2
Scientific paper
During a run of the Common Programme Three of the EISCAT radar the splitting of an auroral arc was observed by high time-resolution, ground-based cameras when the UHF radar beam was close to the arc. The evening eastward electrojet situation with a large-scale northward ionospheric electric field was disturbed by the intrusion of a convection channel with southward electric field from the east. The interaction of the new convection channel with the auroral arc caused changes in arc brightness and arc splitting, i.e. the creation of a new arc parallel to the pre-existing auroral arc. The event is described as one possibility for the creation of parallel arcs during slightly disturbed magnetic conditions far from the Harang discontinuity. Acknowledgements. We would like to thank the director and staff of EISCAT for the data used in this study. EISCAT is supported by the scientific research councils of Finland, France, Germany, Norway, Sweden and the UK. We would like to express our special thanks to A. P. van Eyken and U. P. Løvhaug for their cooperation and assistance in running the IPS campaigns and to W. P. Wilkinson for discussions on fast-stream/slow-stream interaction regions. Two of us (ARB and PJM) are supported by PPARC. Topical Editor D. Alcaydé thanks J. F. Mckenzie and M. Pick for their help in evaluating this paper.--> Correspondence to: A. R. Breen-->
Buchert Stephan
Frey Harald U.
Haerendel Gerhard
Lanchester B. S.
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