A Cyclogram Analysis of the Bratislava 14C Tree-Ring Record During the Last Century
1989; Cambridge University Press; Volume: 31; Issue: 03 Linguagem: Inglês
10.1017/s0033822200012467
ISSN1945-5755
AutoresM. R. Attolini, Menotti Galli, T. Nanni, Pavel P. Povinec,
Tópico(s)Astro and Planetary Science
ResumoRadiocarbon variations in dated tree-ring samples represent an important tool for the study of the history of solar activity and sun-earth relationships. From this point of view, an investigation of the 11-year radiocarbon cycle is very important. Our cyclogram analysis of the Δ 14 C record in tree-ring samples during the last century has confirmed previous results obtained by conventional harmonic analysis, eg, the average amplitude of 2, the phase shift of 3–5 yr for different 11-yr solar cycles, and the anticorrelation dependence of Δ 14 C on Wolf sunspot numbers. The observed shorter periodicity (ca 9 yr for Δ 14 C compared to 10.5 yr for sunspots), may be due to extra factors in sun-earth relationships.
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