ocr: ENERGETIC PARTICLES For nearly 30 years it was thought that all solar energetic particles (SEPS) were accelerated in solar Hares. It has become clear that the largest and most en- ergetic particle events at Earth are associated with shock waves driven out into interplanetary space by coronal mass ejections. Energetic solar protons are a radiation health hazard for astronauts. The arrival time in the near-tarth environment can begin within tens of minutes of the erup- tion. While low inclination orbits take advantage of the shielding of the Earth's magnetosphere, high inclination orbits place t ...
