Simultaneous observations of aurorae in the northern and southern polar caps.

The positions of discrete auroral forms in the northern and southern polar caps are compared for four time intervals. UV Viking-satellite data were used for the northern polar cap, while all-sky-camera data from the Vostok station were used for the southern polar cap. It is shown that the discrete auroral forms can appear in the same time sector, can be located symmetricaly with respect to the midday/midnight line, or can appear only in one hemisphere.