Fig. 1.
Time evolution of the total unsigned magnetic flux (USFLUX), the total unsigned vertical current (TOTUSJZ), the total unsigned current helicity (TOTUSJH), and the total photospheric magnetic free-energy density (TOTPOT) for active region NOAA 11166 (SHARP 401). The thick dashed vertical blue line corresponds to an X-class solar flare, and the thin dashed vertical blue line corresponds to an M-class solar flare.
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