Energy dependence of the solar proton events at 1 AU

Details Energy dependence of the solar proton events at 1 AU Energy dependence of the solar proton events at 1 AU

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..473k&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

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Solar Proton Events

Scientific paper

As has been recognized recently, data on size (frequency) distributions for different sets of solar flare parameters are very helpful for modeling flare and acceleration processes. In this work we analyze long-term data (1970-2001) verifying carefully published catalogues of Solar Proton Events (SPEs) and real measurements that were carried out onboard several spacecraft. We have separated at first 232 events above 10 MeV with proton flux >10pfu (particles × cm-2 s-1 sr-1) associated with identified sources (flares). We have also created catalogues of these events identified the proton fluxes for the energy threshold >10 MeV, as well as for proton fluxes >30 MeV, >60 MeV and >100 MeV above 10-2 pfu. Differential size distributions of the peak values of these events have been constructed separately for each energy integral threshold and have been fitted by power law with indices between 1.28 and 1.35 depending on energy. Then, within this database of SPEs a second set of events originated only from flares with longitude >25°W, was formed. The slopes of the responding size distributions in the energy range 10-100 MeV seem to be greater than the other ones including full disk flares-related events. Moreover it was found that a certain difference exists in the slopes at >10 MeV and >500 MeV in the size distributions constructed on the base of those solar proton events associated with ground level enhancement (GLE) in Neutron Monitors network (E > 500 MeV). This may point to a dependence of slope on the proton energy under consideration.

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