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During a campaign in January 1988 we observed auroral arcs with the EISCAT UHF radar system and a low light level TV camera. The aim was to compare apparent motions of the arc and its small-scale structures with plasma motions in the adjacent F-region. It was found (1) that there was a relative motion between arc and plasma of the order of 100-200 m/s southward and (2), in confirmation of earlier...