Passive Carrington Longitudes of Solar Cosmic Ray Sources in Solar Cycles 19–24

Abstract

Distribution of the fluences of solar proton events in solar cycles 19–24 over the Carrington longitude of their sources on the Sun has been considered. An interval of “passive” Carrington longitudes, extensive over the longitude (≈100–170°) and the lifetime (the whole period of observations) has been discovered, which very rarely produced the powerful solar proton events. It was earlier found in cycles 19–23 and now confirmed for the complete cycle 24 as well.