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VARIATIONS OF MAGNETIC FIELD STRUCTURE AND SOLAR FLARE OCCURRENCE
Some observations of SOHO magnetograms show signatures of magnetic energy release temporally coincident with large flares. Variations of the line-of-site magnetic field occurred on a time scale of a few minutes during the observed flare explosions. This suggests that the photospheric magnetic fields play important role in solar flare physics. The magnetic field topology structure changers and active region flare activity observed during October - November 2003 is under consideration. The high space and temporal resolution observations obtained with SOHO instruments combined with data from other space- and ground-based observatories are used to study the photospheric magnetic fields and coronal structures associated with active region evolution and flare events. Since large solar flares are usually associated with complex active regions, the dependence of flare types and classes from active region magnetic field parameters, magnetic field structures, and evolution phases
are examined. Coronal structure evolution associated with active region evolution and flare events are investigated also. The positive and negative polarity photospheric magnetic flux emerging/disappearing rates are evaluated. Magnetic flux disbalances during the different flare events and the whole period are analyzed.