Alternate Definitions for Solar Energetic Particles

During an eruptive event on the sun, the sun can emit very fast, very energetic particles that travel at about 80% the speed of light. Such charged particles can reach Earth's magnetosphere either in the wake of a flare, or propelled ahead of a coronal mass ejection. In either case the energy they dump into the atmosphere can create what's called a solar radiation storm, which can cause low frequency radio blackouts at Earth.

High energy (keV to GeV) protons, electrons and ions which come from the Sun.