The time variation in the power of the chromospheric (thick line) and photospheric (thin line) narrowband (4.7–6.7 mHz) LOS velocity signals in the umbra of the leading spot of NOAA 791. The upper panel shows the signals of the spatial element of 1′′ at the centre of the umbra. The bottom panel shows the signals averaged over the 10′′ region in the umbra. Right panel shows the correlation between the signals presented in the upper panel.
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