400 year record of Δ14C in tree rings: the solar-activity cycle before, during and after Maunder Minimum and the longer cycles.

Details 400 year record of Δ14C in tree rings: the solar-activity cycle before, during and after Maunder Minimum and the longer cycles. 400 year record of Δ14C in tree rings: the solar-activity cycle before, during and after Maunder Minimum and the longer cycles.

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ncimc..16..419a&link_type=abstract

Nuovo Cimento C, Vol. 16, N. 4, p. 419 - 436

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Solar-Terrestrial Relations: Solar Activity Cycles

Scientific paper

The analysis of Δ14C in dated tree ring series from 1600 to 1940 AD is presented. The data series is divided into two parts, namely before and after 1780 AD to better study the characteristic of its cyclicities before, during and after the Maunder Minimum period. The data after 1780 AD show the presence of significant cyclical variations in the 10 - 12 year range, similar to the ones observed in other solar-activity index series. On longer time scales, only the "Gleissberg" cycle, which appears to modulate the 11 y cycle, seems to be significant. The origin of this last fluctuation in radiocarbon production is influenced by cosmic-ray intensity variations connected to long-term solar-wind flux variations. The analysis of Δ14C in two independent series of dated tree rings during 1564 - 1780 AD shows that there is an enhancement in radiocarbon level during the Maunder Minimum. The data show that there are time variations of 14C production rate even during the Maunder Minimum, as cosmic rays were modulated by the Sun in spite of the very low solar activity.

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