VARIABILITY OF DAYSIDE HIGH-LATITUDE CONVECTION ASSOCIATED WITH A SEQUENCE OF AURORAL TRANSIENTS

10 second resolution ionospheric convection data covering the invarian t latitude rang from 71 degrees to 76 degrees, obtained by using the E ISCAT UHF and VHF radars, are combined with optical data from Ny Alesu nd during a sequence of amoral transients in the post noon sector (sim ilar to 15 MLT). Satellite observations of polar cap convection patter ns suggest negative B-Z and B-Y components of the interplanetary magne tic field. Burst-like enhancements of westward (sunward) post-noon con vection were accompanied by eastward moving auroral forms at higher la titudes, above the convection reversal boundary. In this case the back ground convection was weak, whereas the integrated potential drop acro ss the radar held-of-view associated with the westward how bursts was typically similar to 20-35 kV. The auroral phenomenon consists of a se ries of similar events with a mean repetition period of 8 min. A close correlation between the auroral activity and convection enhancements in the cleft ionosphere is demonstrated.