Specific features in the countermotion of substorm auroral intensifications

The dynamics of northern auroral structures drifting equatorward and bright auroral forms of substorm intensifications in the south, simultaneously moving northward, is analyzed based on data from the Lovozero, Loparskaya, and Tumanny auroral stations and using effective methods for filtering TV images. A fundamentally new fact that the structures of northern intensifications drifting southward cross the structures of southern intensifications propagating northward has been discovered. The effect is detected statistically and is only clearly defined on filtered keograms. The presence of this effect possibly means that northern structures and intense breakup auroras in the south have radically different sources and are caused by different mechanisms by which electrons accelerate and precipitate.