Relativistic solar protons in the event of January 20, 2005: Model studies |
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| Authors: | E V Vashenyuk Yu V Balabin B B Gvozdevskii S N Karpov |
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| Institution: | (1) Polar Geophysical Institute, Kola Scientific Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmansk oblast, 184200, Russia;(2) Baksan Neutrino Observatory, Institute for Nuclear Research, Russian Academy of Sciences, Neutrino, Tyrnyauzskii District, Kabardino-Balkaria, 361609, Russia |
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| Abstract: | Using the optimization methods, the characteristics of relativistic solar protons (RSPs) have been obtained from the data of ground-based cosmic ray detectors in the event of January 20, 2005, which was the largest event in the last 50 years since the event of February 23, 1956. The RSP dynamics during the event has been studied. The existence of two populations (components) of particles, fast and delayed (slow) has been shown. The fast component with a hard exponential energy spectrum and strong anisotropy was shown as a giant pulselike enhancement at several southern polar stations. The delayed component had a power-law energy spectrum and a wider pitch-angle distribution, which caused the enhancement effect at the majority of stations at the global network. |
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