Fig. 6.
Temporal evolution of the sunspot in active region NOAA 11277 for seven days starting at 07:47 UT on 2011 August 28 (top-left to bottom-right panels). All images are normalized to the intensity of the local continuum. The yellow contours represent the intensity at 0.5I0. The green contours depict the magnetic field component perpendicular to the solar surface (Bz) at 1867 G (Jurčák criterion).
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