INAF - Catania Astrophysical Observatory

All daily drawings of the sunspot groups and USSPS produced by INAF - Catania Astrophysical Observatory are available in this page.
The drawings of sunspot groups and pores are maken by a Cooke refractor (150mm/2230 mm) on a 24.5 cm diameter projected image of the Sun.

USSPS Archive

This archive allows to download the USSPS and the daily drawings produced by INAF - Catania Astrophisical Observatory. Selecting year and month, it is possible to get a list of all the USSPS available for that date.

After a click on the "Search" botton the number of the found records is provided. Each record is identified by the date of observation. For each record three links appear:

A gray bar reporting different week of the year will help to distinguish different time intervals.

Solar observations of the photosphere and chromosphere have been carried out at INAF - Catania Astrophysical Observatory (OACt) since 1876, the year of its foundation.

The program for the observations of the Sun is performed by means of an equatorial spar equipped with: