Abstract
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.
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