PREDNASAJUCI / LECTURER : Zuzana Krisandova NAZOV / TITLE : Changes in brightness of comets due to solar activity ABSTRAKT / ABSTRACT : We study cometary activity. The main cause of activity is the process of sublimation. It is a combination of surface and subsurface phenomena. We want to examine changes in brightness of comets according to phases of the solar cycle, or examine the effect of nonstationary phenomena in the sun to sudden changes in brightness (bursts) of comets. The main source of data used available databases of photometric brightness of comets and the solar indices database. Database of photometric brightness of comets possibly we expand on own observations obtained at Skalnate Pleso observatory (0.61-m reflector using the CCD camera SBIG ST-10XME). The main candidate of research is comet 29P/Schwassmann-Wachmann 1, which has a unique cometary orbit, and its brightness is changed very irregularly, and suddenly without apparent cause.