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Four different methods are applied here to study the precursors of flareactivity in the Active Region NOAA 10486. Two approaches track the temporalbehaviour of suitably chosen features (one, the weighted horizontal gradientWGM, is generalised form the horizontal gradient of the magnetic field, GM;another is the sum of the horizontal gradient of the magnetic field, GS, forall sunspot pairs). WGM is a photospheric indicator that is a proxy measure ofmagnetic non-potentiality of a specific area of the active region, i.e. itcaptures the temporal variation of the weighted horizontal gradient of magneticflux summed up for the region where opposite magnetic polarities are highlymixed. The third one, referred to as the separateness parameter, S(lf),considers the overall morphology. Further, GS and S(lf) are photospheric newlydefined quick-look indicators of the polarity mix of the entire active region.The fourth method is tracking the temporal variation of small x-ray flares,their times of succession and their energies observed by the Reuven Ramaty HighEnergy Solar Spectroscopic Imager instrument. All approaches yield specificpre-cursory signatures for the imminence of flares.

Dynamic Precursors of Flares in Active Region NOAA 10486