Atmospheric 14C and century-scale solar oscillations

Here we show from maximum-entropy spectral analysis of a 9,600-yr high-precision 14C chronology that changes occur in the Sun's convective zone with a fundamental oscillatory mode of about 2.4 X 10-3 yr-1 (420-yr period). We also identify several harmonics. Previous searches for cyclicity in the atmospheric 14C record have yielded periods near 140 and 200 yr. We discuss the implications of a longer and more precise 14C record. (author)