Regularities in the occurrence of relativistic SCR events

The regularities in the occurrence of relativistic solar proton (RSP) event s are investigated using the RSP data obtained for many years with a neutro n monitor at Apatity, Kola Peninsula. A certain regularity of these events is noticed along with their extremely sporadic occurrence: the RSP events a rise in the even and odd cycles of solar activity during its rise and decay phases and, in addition, in the even cycles at the solar activity maximum. A possible reason for such activity may be related to the cyclic evolution of magnetic fields and, in particular, to the coronal holes on the Sun.