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The results of coordinated EISCAT andTV-camera observations of a prebreakup event on 15 November 1993 have beenconsidered. The variations of the luminosity of two parallel auroral arcs,plasma depletion on the poleward edge of one of these arcs as well as electronand ion temperatures in front of a westward travelling surge were studied. Itwas found that a short-lived brightening of a weak zenith arc before an auroralbreakup was accompanied by fading of an equatorial arc and, vice versa. A plasmadepletion in the E region was detected by the EISCAT radar on the poleward edgeof the zenith arc just before the auroral breakup. The plasma depletion wasassociated with an enhancement of ion (at the altitudes of 150–200 km) andelectron (in E region) temperatures. During its occurrence, the electric fieldin the E-region was extremely large (~150 mV/m). A significant increase inion temperature was also observed 1 min before the arrival of a westwardtravelling surge (WTS) at the radar zenith. This was interpreted as theexistence of an extended area of enhanced electric field ahead of the WTS

Imaging and EISCAT radar measurements of an auroral prebreakup event