Fig. 1
Upper panels: snapshots of the UFs in sunspot active regions on January 26, 2015 (01:57:54 UT), January 10, 2016 (01:33:52.6 UT), and March 27, 2016 (01:49:28.6 UT) obtained by SDO/AIA (1600 Å). The broken black rectangles show the umbral regions. The arrows indicate the UFs sources. Middle panels: corresponding sunspot regions at 171 Å. The original maps (contours) overlapped on variation maps (colour background) of UV emission obtained during the observation.Asterisks denote the localization of the UFs sources. Bottom panels: scaled variation maps of the umbral regions at 1600 Å. The small white rectangles show sources of UFs.
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