Solar energetic particles
High-energy particles from the Sun / From Wikipedia, the free encyclopedia
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Solar energetic particles (SEP), formerly known as solar cosmic rays, are high-energy, charged particles originating in the solar atmosphere and solar wind. They consist of protons, electrons and heavy ions with energies ranging from a few tens of keV to many GeV. The exact processes involved in transferring energy to SEPs is a subject of ongoing study.
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SEPs are relevant to the field of space weather, as they are responsible for SEP events and ground level enhancements.