Fig. 1
Left panel: HMI intensitygram of the large sunspot (circled) observed in the active region NOAA 11166. The active region field-of-view is [225″ × 125″]. The active region center coordinates are [−230″ × 300″] obtained at 20:00 UT 2011 Mar. 07. Right panel: magnetic field strength as a function of time (time series) measured in the sunspot highlighted by the circle (left panel). The time series starts at 00:00 UT 2011 Mar. 07.
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