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ALGORITHM AND PREDICTABILITY
The algorithm was tested through a retrospective prediction for the period from 11 to 25 December 1990 (the polarization distribution and the ratio Nb/Nf were taken into account). During this period, 7 AR’s crossed the solar disk, in which 20 flares of importance ³ M1.0 and 2 flares of importance ³ X1.0 were recorded. The forecast in terms of flares scored 60%, and no false alarms occurred. Thirty-eight cases of no flares were predicted for all AR’s during the above-indicated period, with 79% predictability; flares were recorded in 8 cases (21%) with "no" prediction.