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Dayside aurora signatures associated with ionospheric travelling twin vortices

Optical observations at Barensburg and Hiss Is. during periods of magnetic impulse events are examined. Fifty-three percent of magnetic impulses are shown to be accompanied by pronounced auroral signatures. The equatorward 1 degree(s) - 2 degree(s) latitude displacement of the dayside red auroral band and simultaneous increasing of its intensity were observed for about 5 - 10 min before the magnetic impulses. During the magnetic events two rayed auroral forms appeared usually in the equatorward part of the red band. At first the discrete aurorae moved toward the pole and then generally to the west (tailward) and disappeared in 4 - 8 min. The equatorial boundary of the red luminosity band was back to its pre-event position in 20 - 30 min. The structure and dynamics of a few ionosphere current systems caused magnetic impulses were investigated with the high latitude network of magnetometer. Ionospheric currents had a twin vortices structure with the cells separated in the west-east direction.