Solar Hα excess during Solar Cycle 24 from full-disk filtergrams of the Chromospheric Telescope

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Fig. 7.

Regions of interest (ROIs) extracted from ChroTel Hα full-disk filtergrams, displaying the disk passage (days 4–11) of three active regions in 2013 during the maximum of Solar Cycle 24: NOAA 11850 (top), NOAA 11835 (middle), and NOAA 11818 (bottom). The respective mask for each ROI is displayed with red contours.

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