Latest light curve

Daily light curve determined using the full disk images in the center of the Halpha line acquired by INAF - Catania Astrophysical Observatory is available in this page.

When the weather conditions permit, the light curve is obtained with an average cadence of one image per minute. The light curve describes the trend of the maximum over the average brightness of the solar disk of the recorded HAlpha images (red dots). The GOES X-ray 16 1-8 Angstrom band (blu line) shows the observed flux to track solar activity.

The signal is normalized by the exposure time. The light curve takes into account the approximation model for solar intensity vs air mass proposed by Meinel & Meinel (1976). The air mass as function of the zenith angle of the Sun has been computed by the model of Kasten & Young (1989).