Fig. 2.
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Evolution of Helicity parameters for AR 13590. (a) Magnetic helicity accumulation for AR 13590 together with its potential and current-carrying components, (b) Helicity imbalance for AR 13590. Purple vertical lines indicate X-class flares, while yellow vertical lines indicate M-class flares. Accumulated helicity time series is normalized by cadence time unit t = 720 s.
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