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Possible Frequency Modulation Effects Singled Out by the Fourier Vector Amplitude in a δ14C Yearly Series of Georgian Wines

Published online by Cambridge University Press:  18 July 2016

Elisabetta Pierazzo  and
Silvia Sartori
Elisabetta Pierazzo
Affiliation:
Dipartimento di Fisica “G Galilei”, Università, I 35131 Padova, Italy and Laboratori Nazionali INFN, I 35020 Legnaro, Italy
Silvia Sartori
Affiliation:
Dipartimento di Fisica “G Galilei”, Università, I 35131 Padova, Italy and Laboratori Nazionali INFN, I 35020 Legnaro, Italy
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Abstract

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The Δ 14C series of yearly sampled cosmogenic 14C in wines (1909–1952) was analyzed with the Fourier Vector Amplitude (FVA) method, using cyclograms as a graphic tool, to find information on periodicities imprinted by the sun. Because the high sensitivity of the FVA algorithm in detecting periodicities and their variations is emphasized by immediate visualization of its cyclograms, a suggestion has been found for a modulation event. Data are compared with a frequency modulation model, the extension of which to the long 9000–a Δ 14C series suggests a first approach to interpret the Suess wiggles.

Type
III. Global 14C Variations
Information
Radiocarbon , Volume 31 , Issue 3: June 20-25, 1988 Dubrovnik, Yugoslavia , 1989 , pp. 725 - 739
Copyright
Copyright © The American Journal of Science 

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