Observational Features and Databases of Solar Cosmic Rays
Due to spacecraft measurements, at present it became possible to observe solar particles near the Earth’s orbit (at 1 AU) in the range of E ≤ 0.5 MeV/nucleon, and an occurrence rate of the SPEs turned out to raise drastically with decreasing of the threshold energy of their registration. An average rate of the SPE occurrence is no more than 1.0 at E > ≥ 435 MeV/nucleon, about 2.0 at E ≥ 100 MeV/nucleon, and ≥ 250 event/year at E ≤ 10 MeV/nucleon (for protons). Decreasing of the threshold energy of registration, increasing of the detector sensitivity and duration of spacecraft measurements allowed to conclude that the Sun is, in fact, a permanent source of energetic particles with the energies of E ≥ 1 MeV/nucleon.
KeywordsSolar Wind Coronal Mass Ejection Solar Flare Observational Feature Neutron Monitor
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