Frequency distributions of solar proton events

Details Frequency distributions of solar proton events Frequency distributions of solar proton events

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64..489g&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 5-6, p. 489-496.

Physics

6

Scientific paper

A study has been coordinated of 147 solar proton events (SPEs) with proton energies >10MeV and peak intensities >10protonscm-2s-1sr-1 ``particle flux units (pfu)'' at the Earth's orbit that were measured between 1976 and 1999. This study has been done in association with other related activities such as sunspot numbers, solar flare index, H-alpha solar flares, magnetic field of the Sun, high-speed solar wind streams, and galactic cosmic-rays. The time frequency and size distributions of the peak intensities of the SPEs have been obtained over the entire period and over the ascending-descending phases of each solar activity cycle. For the threshold intensity of >10pfu the differential size distributions have a power-law form with a slope of /-1.3+/-0.2 with no evidence of any change with time, which is in agreement with the results of other authors in different time intervals. An updated catalogue of the solar proton events with energy >10MeV and peak flux >10pfu is presented. It is based on the Moscow University catalogue (Catalogue of Solar Proton Events 1987-1996, Moscow University, Moscow) for the period 1987-1996. The events are separated into two categories (ordinary and anomalous) with respect to their sources at the Sun, their peak intensity, and their ground level enhancements. The relation between high-energy H-alpha flares and proton events associated with neutron monitor enhancements is discussed in order to be useful for the determination of acceleration processes at the flare site and in very rare interplanetary magnetic conditions.

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