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Cosmic Rays (CR) are particles which come to the earth from Universe. Theirorigin and production mechanisms are still unknown. The Pierre AugerObservatory is located in Mendoza, Argentina. It is dedicated to the study ofCR. When CR arrive to the earth's atmosphere they produce a shower of secondaryparticles called \textit{air shower}. The surface detector (SD) of the PierreAuger Observatory consists of tanks full of pure water, where CR produce\textit{Cherenkov radiation}, when going through them. This light is detectedby three photomultiplier tubes (PMT) located on the top of each tank. Dependingof the angle of arrival direction of the primary CR, each PMT is able toregister different signal than the other. The goal of this study is to look atthese effects of direct light on the PMT's to explore if they change in time.The obtained results may give information about the physical status of thetanks in order to monitor the work of the SD, and to estimate possiblesystematic effects on the measurements. The current results of this study areshown.

Effects of the direct light in the surface detectors (SD) of the Pierre Auger Observatory and their change in time