Time variations in (a) Hα chromospheric intensity, (b) chromospheric LOS velocity, and (c–e) band-filtered LOS velocities at two points, ‘o’ and ‘♢’ in the umbra, as is marked in Fig. 4. The shaded gray regions correspond to the predicted data using an autoregressive model since data are missing. The vertical green line indicates the observing time of the maps presented in Fig. 4. The two vertical cyan lines indicate the start and end time for the correlation analysis.