Null-point topology resulting from the NLFF extrapolation. Left panel: grey shading indicates the line-of-sight magnetic field. Pink and blue iso-contours correspond to positive and negative Blos = ± 40,250,750 G, respectively. Blue and yellow field lines indicate respectively the spine and the fan separatrices. Right panel: co-spatiality between the chromospheric solar ribbons observed at 1600 Å and the location of the separatrix footpoints. The x- and y-axis units are in arcseconds defined by the CEA projection.
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