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CHANGES IN SOLAR ACTIVITY DURING THE WOLF MINIMUM—NEW INSIGHTS FROM A HIGH-RESOLUTION 14C RECORD BASED ON DANISH OAK

Published online by Cambridge University Press:  04 December 2020

Alexandra Fogtmann-Schulz*
Affiliation:
Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, 8000 Aarhus, Denmark
Claudia Baittinger
Affiliation:
Environmental Archaeology and Materials Science, National Museum of Denmark, Copenhagen, Denmark
Christoffer Karoff
Affiliation:
Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, 8000 Aarhus, Denmark Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark iCLIMATE Interdisciplinary Centre for Climate Change, Aarhus University, Roskilde, Denmark
Jesper Olsen
Affiliation:
Aarhus AMS Centre (AARAMS), Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark Centre for Urban Network Evolutions (UrbNet), Aarhus University, Aarhus, Denmark
Mads F Knudsen
Affiliation:
Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, 8000 Aarhus, Denmark iCLIMATE Interdisciplinary Centre for Climate Change, Aarhus University, Roskilde, Denmark
*
*Corresponding author. Email: alfosc@geo.au.dk.

Abstract

We present a new biennial record of radiocarbon (14C) measured in Danish oak. The new record covers the years 1251–1378 CE, thereby spanning the Grand Solar Minimum known as the Wolf Minimum. Two oak samples from every other year were measured at the AMS facility at Aarhus University (Denmark), resulting in an average precision of 1.4‰ for the record. Spectral analysis of the new record revealed two peaks at 27 and 9.1 years, which could indicate the Hale cycle was lengthened and the Schwabe cycle shortened during the Wolf Minimum, but it is also possible that the amplitude of the Schwabe cycle was too small to be accurately identified with the acquired precision of this record. The record was bandpass filtered to investigate the variability of the amplitude in different bands, which showed a dampening of the amplitude during the second half of the Wolf Minimum in bands centered on the Schwabe and the Hale cycle, respectively. A reconstruction of the solar modulation function, Φ, also showed a periodicity of ca. 9 years, and indicated that the Wolf Minimum was preceeded by one cycle of decreased solar activity.

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press for the Arizona Board of Regents on behalf of the University of Arizona

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