Fig. 3
a) A three colour composite SDO image taken from the accompanying movie. The EUV 304 Å and 211 Å filter images fill the blue and green colours and the red is filled with the line-of-sight magnetic field. b) 211 Å base difference image. The crest of a sunspot wave is indicated with a yellow arrow. The red arrow points to a “footpoint” brightening.
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