USET synoptic images/L1centered

The USET station also hosts since 2002 three modern telescopes equipped with digital cameras recording full-disk images of the Sun in three different parts of the visible-light spectrum: broad-band white-light to observer the photosphere, and two telescopes with narrow-band filters (H-alpha line at 656.3 nm and Ca II K line at 393.37 nm) to monitor the chromosphere, where solar eruptive phenomena can be detected. The images have been recentered (less than 1 pixel precision), information about coordinate system was added in the header, so that data can be further processed with existing solar libraries and softwares. The image file format is FITS. The FITS header has been made homogeneous throughout the dataset and complies with the SOLARNET recommendations.