The filament at 12:00 UT on November 16. From top to bottom: (a) contrast enhanced Hα image from Kanzelhöhe Solar Observatory, (b) contrast enhanced AIA λ171 Å image, (c) contrast enhanced AIA λ304 Å image, and (d) two-hour average of 160 magnetograms clipped between ± 25 G. The contour of the Hα filament in panel a is plotted in panels b, c, and d. The white boxes labeled A and B mark the regions that we use later to determine the horizontal proper motions (region A, see Figs. 5 and 6) and the counter-streaming flows (region B, see Fig. 8)
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