Fig. 3.
NOAA AR 11591, top panels: continuum intensity maps for longitudes −60°, 0° and 30°. The legend in the lower right corner of the top left panel defines the contour levels. Different formation heights are accounted for (Eq. (1), Δh = 465 km). The cyan arrow originates in the centroid of the umbra and points towards disc centre. Bottom three rows: magnetic field parameters retrieved along the Ic = 0.5Iqs contour. The temporal evolution is available online.
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