Regularities of solar energetic particle events and fluxes

Abstract

Some regularities related to solar energetic proton (SEP) events and fluxes have been established. It is shown that the rate of SEP events is proportional to the Wolf numbers and that the distribution functions of SEP events related to both different levels and cycle phases, divided by the sums of Wolf numbers, are identical. It is concluded that extremely large SEP events may also occur in periods of minimum solar activity. This conclusion is confirmed by the experimental data obtained at the end of 2004 and in 2005.