Active regions on the Sun with high flare productivity and strong geomagnetic efficiency

Abstract

Abstract.Relations between the geomagnetic Ap-index and magnetic and flare parameters of the super active regions (SARs) are analysed. The small and mean SARs having the spot areas S 1000 µh seem to differ from the SARs being large δ-spots (SARs-δ) not only by their parameters but also by relations between them.