Fig. 6
Time evolution of the spatial sources of 3-min oscillations of the microwave polarisation signal from sunspot NOAA 10756, obtained with NoRH at 17 GHz on May 04, 2005, during the 3-min frequency drift 03:20–04:30 UT. The grey colour scale shows the power of the oscillation. The dashed curve indicates the umbra-penumbra boundary. The integer numbers label the instants of time shown in Fig. 5. The letters label individual sources of the oscillations.
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