Аннотация:Solar proton events during a period from 1956 to 2012 are considered. Fluences of protons of various energies in these events have been computed. On the basis of this extensive data set the inhomogeneity of the distribution of their sources on the Sun along the Carrington longitude have been confirmed, which had been earlier revealed in our studies (Getselev et al., Proc. of conference "Modern Problems of Solar Cyclicity", St.-Petersburg, 1997; Bulletin of Russian Academy of Sciences: Physics, 2003; Proc. of 31st Russian Cosmic Ray Conference, Moscow, 2010). Special attention is payed to the discovered interval of "passive longitudes", extensive over the longitude (~90-170 degree) and the lifetime (the whole period of observations). The summarized proton fluence of the events, which sources belong to this interval of Carrington longitudes, is considerably lower, then the summarized proton fluences of the events in other heliolongitude intervals. From the 60 most powerful solar proton events during the whole period of observations not more than 1 event have been originated from this interval of passive longitudes.