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We explore the association of non-neutralized currents with solar flareoccurrence in a sizable sample of observations, aiming to show the potential ofsuch currents in solar flare prediction. We use the regularly produced highquality vector magnetograms by the Helioseismic Magnetic Imager and morespecifically the Space weather HMI Active Region Patches (SHARP). Through anewly established method, that incorporates detailed error analysis, wecalculate the non-neutralized currents contained in active regions (AR). Twopredictors are produced, namely the total and the maximum unsignednon-neutralized current. Both are tested in AR time-series and a representativesample of point-in-time observations during the interval 2012-2016. The averagevalues of non-neutralized currents in flaring active regions are by more thanan order of magnitude higher than in non-flaring regions and correlate verywell with the corresponding flare index. The temporal evolution of theseparameters appears to be connected to physical processes, such as fluxemergence and/or magnetic polarity inversion line formation that are associatedwith increased solar flare activity. Using Bayesian inference of flaringprobabilities, it is shown that the total unsigned non-neutralized currentoutperforms significantly the total unsigned magnetic flux and other wellestablished current-related predictors. Thus, it shows good prospects forinclusion in an operational flare forecasting service. We plan to use the newpredictor in the framework of the FLARECAST project along with other highlyperforming predictors.

Non-neutralized electric currents in solar active regions and flare productivity