Secular variations in solar flare proton fluxes

Details Secular variations in solar flare proton fluxes Secular variations in solar flare proton fluxes

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc....2..373g&link_type=abstract

IN: International Cosmic Ray Conference, 18th, Bangalore, India, August 22-September 3, 1983, Conference Papers. Volume 2 (A85-2

Statistics

Secular Variations, Solar Flares, Solar Protons, Proton Flux Density, Statistical Analysis

Scientific paper

Proton fluences in contemporary solar-flare events (1965-82) are analyzed to obtain values of average flux and characteristic rigidity R0 (MV). Both proton fluences F (E greater than 10MeV) and R0 (in the energy interval 10-30 MeV) values for individual events follow log-normal distribution. Comparison of contemporary average flux and R0 values with long-term averaged values, based on lunar sample data, indicate that the ancient solar-flare proton spectra were harder compared to that observed in contemporary flares. The contemporary and long-term (greater than 10,000 yr) averaged fluxes are similar, although such a comparison may not be meaningful because the contemporary averages suffer from uncertainty due to statistics of a single event. The long-term average data suggests a secular variation in solar-flare activity with enhanced proton fluxes during the last 100,000 years.

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