Mathematics – Logic
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979izssr..43..800d&link_type=abstract
(Seminar po Iadernoi Kosmicheskoi Fizike, 10th, Leningrad, USSR, Oct. 1978.) Akademiia Nauk SSSR, Izvestiia, Seriia Fizicheskaia
Mathematics
Logic
Carbon 14, Cosmic Rays, Radioactive Age Determination, Secular Variations, Abundance, Annual Variations, Chronology, Concentration (Composition), Dipole Moments, Earth Atmosphere, Long Term Effects, Solar Activity, Trees (Plants)
Scientific paper
Some aspects of studies of past cosmic-ray intensities based on the abundance of cosmogenic isotopes in specimens of known age are reviewed. Special attention is given to studies based on C-14 activity levels in dendrochronologically dated samples, particularly the California bristlecone pines whose ages have been determined to be greater than 4000 yr. The dendrochronological time scale is considered, along with stable and radioactive isotopes in tree rings, the present-day cosmic-ray intensity, and the C-14 activity level at the present epoch. The cosmic-ray intensity and C-14 abundance in the period from 1700 to 1900 and at times of extremely low solar activity are examined. The C-14 concentration in supernovae and the C-14 abundance in earth's atmosphere at times of minimum geomagnetic dipole moment are also discussed.
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