Very long solar periods and the radiocarbon record

Physics – Space Physics

Scientific paper

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Atmospheric Composition, Carbon 14, Radioactive Age Determination, Cosmic Rays, Galactic Radiation, Magnetic Flux, Radiant Flux Density, Solar Magnetic Field

Scientific paper

It is pointed out that radiocarbon is produced in the earth's atmosphere by the nuclear reaction N-14(n,p)C-14. The photosynthesis by trees of carbon in the form of CO2 provides an estimate of the C-14/C-12 ratio and, therefore, the atmospheric inventory of C-14 at the time of take-up. The existence of periodicities in the radiocarbon record has been considered by Suess (1965, 1971, 1980). The present investigation is concerned with these periodicities. Periodicities in the radiocarbon record are related to variability in the modulation of the galactic component of the incoming cosmic ray flux, mediated by the oceanic and atmospheric reservoirs. The long periods observed are an indicator of corresponding changes in the hydromagnetic output of the sun, which might be caused by changes in the intensity of the magnetic field escaping from the solar atmosphere.

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