Long term variations in solar flare activity

Details Long term variations in solar flare activity Long term variations in solar flare activity

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981japa....2..201g&link_type=abstract

Journal of Astrophysics and Astronomy, vol. 2, June 1981, p. 201-212.

Astronomy and Astrophysics

Astrophysics

3

Long Term Effects, Secular Variations, Solar Flares, Energy Spectra, Radioactive Isotopes, Solar Protons, Statistical Analysis

Scientific paper

A statistical analysis of solar flare particle events covering the 1954-1975 period has been made for two parameters: (1) the integrated proton fluence in an event with kinetic energy above 10 MeV, expressed in sq cm, and (2) the characteristic rigidity. Comparison of these data with long-term averaged values determined from stable- and radio-nuclide measurements of lunar samples shows that the ancient solar flare proton spectrum was harder than that of contemporary flares. Using average flux estimates for durations exceeding 1,000 years suggest a possible periodic variation in solar flare activity, with an enhanced flux level during the last 100,000 years.

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