PRELIMINARY ANALYSES OF MAGNETIC AND VELOCITY FIELD OF SOLAR FLARES ABOUT ACTIVE REGION BOULDER 4990 IN April, 1988

The magnetic and velocity fields of the flare of Active Region Boulder 4990(N22, L314) which were obtained with solar magnetic field telescope at Huairou Solar Observing Station in April, 1988 are analysed in this paper. We find that almost flares occured in the zone where different polarities penetrated each other. The peneration of the different magnetic polarities was probably one of the conditions of the flare eruption.