At this work we studied the cosmic radiation muons and put on data acquisition one muon detector which uses the Cherenkov effect as physical process to detect muons. Moreover, we briefly describe the muon origin and we explain how the Cherenkov radiation occurs in water and calculated the number of photons produced in the tank. Lastly, we show the tank estructuring, in which we were able to set the tank in continuous data acquisition, as result we detected a Forbush decrease solar event.