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Fig. 2


First column: accumulation of the magnetic helicity vs. time. Second column: number of features determined by the YAFTA algorithm vs. time. Third column: absolute value of the difference between the numbers of positive and negative features vs. time. The plots of each row correspond to the AR reported in the plot of the first column. t = 0 corresponds to 00:00 UT of the initial day reported in Table 1 (Col. 3). The vertical lines indicate the flare occurrence. The thickness of the vertical lines is equal to 1, 2 and 3 for flares of GOES C, M and X classes, respectively. The flares associated with CMEs are indicated in red.

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