Solar energetic particle events from energy-dependent charge states

Summary form only given. In the interplanetary medium, moderate energy dependence may be created by rigidity - dependent shock acceleration. Solar energetic particles (SEPs) provide information about their source environment. We present observation of solar energetic particles by energy dependent charge states for three large SEP events. In each events, the ionic charge increase by at least nine units over this energy range. Results are explained with respect to the cited models for energy dependent charge states.