Variation in Atmospheric Carbon-14 Activity Relative to a Sunspot-Auroral Solar Index

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Science  05 May 1967:
Vol. 156, Issue 3775, pp. 640-642
DOI: 10.1126/science.156.3775.640


Radiocarbon activity was negatively correlated (P≤.01) with a sunspot-auroral index during 25 designated solar activity periods from 129 B.C. to A.D. 1964. Change in carbon-14 activity during these periods was inverse to change in solar activity in 22 of 24 instances (P≤.001). Contamination from carbon-14 formed during previous solar cycles mnay lessen the value of carbon-14 as a climate or solar index.