Evolution of the total unsigned (black line – upper), positive (red line – lower), and negative (blue line – middle; absolute value) magnetic flux in AR 11283. t = 0 corresponds to 2011 Sept. 5 at 00:00 UT. The shown values correspond to a 96 min time cadence. The error bars are also reported (see text). The vertical lines indicate the time when the M and X flares/CMEs listed in Table 1 occurred.
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