Dynamics of the Energy Spectra of Solar Proton Events Observed in Solar Cycle 23

摘要

The proton energy spectra I(E, t) as functions of time were obtained and analyzed in the energy range of a few tens of MeVon the basis of GOES observations of proton enhancements during solar cycle 23. The energy spectra were approximated by power-law functions. We found a wide variety of functions /(E, t) for studied events. The spectra cannot be described by a universal function of time, although three groups of proton events seem to have some common features. This allows us to outline an approach to their empirical classification in future using a number of dimensionless scaling parameters. The regularities we observe may be partly due to the dynamical processes occurring on the Sun, in the heliosphere, and magnetosphere.