Fig. 2
Variation maps of umbral UV emission in the SDO/AIA different temperature channels (1600 Å, 304 Å, and 171 Å) obtained during 00:00-03:20 UT observation NOAA 11131 on December 08, 2010. Squares with numerals indicate the position of observed UF sources. The arrows show the scanning direction when obtaining the time-distance plots. The dash circle outlines schematically the umbral boundary. The variation intensity is presented by colours in the logarithmic scale.
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