Modeling of the solar energetic particles recorded at Neutron Monitors

Plainaki, Christina G.; Mavromichalaki, Helen A.; Belov, Anatoly V.; Eroshenko, Eugenia A.; Yanke, Victor A.
August 2006
AIP Conference Proceedings;2006, Vol. 848 Issue 1, p258
Academic Journal
Last year the worldwide network of neutron monitors recorded a new ground level enhancement (GLE) of cosmic my intensity (CR) on 20th of January 2005, during the recovery phase of a series of Forbush effects taking place at a time-period very close to the minimum of the current cycle of solar activity. This enhancement seems to be the greatest GLE of the current solar cycle, reaching almost 5000% in some polar stations. A joint analysis of data from ground level stations (neutron monitors) and satellite measurements has been performed in order to calculate the amplitude and the anisotropy of the event as well as the energy of the more fast particles arriving at the Earth. A new GLE — model has been created in order to couple the primary solar cosmic ray flux on the top of the magnetosphere with the flux recorded by neutron monitors and define this way the primary solar cosmic ray spectrum during the event. Moreover, the absorption length of solar energetic particles propagating through the Earth’s atmosphere has been calculated applying the Wilson et al. method (1967). These results have been compared with the respective results calculated for other ground level enhancements. Finally, a comparison between this enhancement and the big GLE of 1956 has been performed. © 2006 American Institute of Physics



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