The image shows the latest Hα image of the Sun acquired at INAF - Catania Astrophysical Observatory with a quality index equal to 1 (1 =good, 3 = bad). When the weather conditions permit, every minute a full disc image of the Sun in the center of the Hα line (656.28 nm ± 0.25 nm) is displayed.
The raw images are recorded with a size of 2200 x 2200 pixels and a digital resolution of 16 bit. The display is refreshed every minute. The spacing of meridians and parallels is 10 degrees.
The image has been preliminarily reduced in order to check its quality and to centre the solar disc. No flat-field correction has been applied. The observations in the Hα line are carried out between 8:00 and 14:00 local time (CET/CEST).