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Fine and Hyperfine Structure in the Spectrum of Secular Variations of Atmospheric 14C

Published online by Cambridge University Press:  18 July 2016

Paul E Damon ,
Songlin Cheng  and
Timothy W Linick
Paul E Damon
Affiliation:
Department of Geosciences
Songlin Cheng
Affiliation:
Department of Geosciences
Timothy W Linick
Affiliation:
Department of Physics, University of Arizona, Tucson, Arizona 85721
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Abstract

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The coarse structure of the 14C spectrum consists of a secular trend curve that may be closely fit by a sinusoidal curve with period ca 11,000 yr and half amplitude ±51. This long-term trend is the result of changes in the earth's geomagnetic dipole moment. Consequently, it modulates solar components of the 14C spectrum but does not appear to modulate a component of the spectrum of ca 2300-yr period. The ca 2300-yr period is of uncertain origin but may be due to changes in climate because it also appears in the δ18O spectrum of ice cores. This component strongly modulates the well-known ca 200-yr period of the spectrum's fine structure. The hyperfine structure consists of two components that fluctuate with the 11-yr solar cycle. One component results from solar-wind modulation of the galactic cosmic rays and has a half-amplitude of ca ±1.5. The other component is the result of 14C production by solar cosmic rays that arrive more randomly but rise and fall with the 11-yr cycle and appear to dominate the fluctuation of the galactic cosmic-ray-produced component by a factor of two.

Type
III. Global 14C Variations
Information
Radiocarbon , Volume 31 , Issue 3: June 20-25, 1988 Dubrovnik, Yugoslavia , 1989 , pp. 704 - 718
Copyright
Copyright © The American Journal of Science 

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