THE SEVERE GEOMAGNETIC STORM GROUP GENERATED BY THE SOLAR ACTIVITEES IN MARCH 1989(ABSTRACT)

Characteristics of the series of severe geomagnetic storms generated by severalextraodinarily large solar flares occured in a super active region(5395) in March 1989 areanalyzed in this paper in association with the location and importance of parent flares.The storm series consisted of at least four independent storms. The most reasonable par-ent flares for these storms can be selected from the flares with optical importance equalto or greater than 2B, X-ray classification being X, and duration longer than 1.5 hours.