Fig. 4
Time–distance plots along the N5 UF source obtained by SDO/AIA at 1600 Å (left panel), and at 304 Å (right panel) temperaturechannels on December 08, 2010. The brightness periodic changes are the 3-min oscillation wavefronts. The arrows showthe UF. The horizontal dashed lines indicate the umbra/penumbra border. The 1D spatial coordinates are in arcsec, the time in UT.
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