Variations in Solar Activity Across the Spörer Minimum Based on Radiocarbon in Danish Oak

A. Fogtmann-Schulz; S. G.K. Kudsk; P. L.K. Trant; C. Baittinger; C. Karoff; J. Olsen; M. F. Knudsen

doi:10.1029/2019GL083537

Variations in Solar Activity Across the Spörer Minimum Based on Radiocarbon in Danish Oak

A. Fogtmann-Schulz^*, S. G.K. Kudsk, P. L.K. Trant, C. Baittinger, C. Karoff, J. Olsen, M. F. Knudsen

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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Abstract

Several aspects concerning the origin and nature of grand solar minima remain unclear, and more high-resolution ¹⁰Be and ¹⁴C records are needed to improve our understanding of these phenomena. Here, we report 137 new high-precision, annually resolved radiocarbon concentrations based on oak from the Danish dendrochronology. The new record covers a period (CE 1432–1578) that encompasses most of the penultimate grand solar minima known as the Spörer Minimum. A detailed comparison between the Spörer and Maunder (CE 1640–1720) minima shows that the Spörer Minimum is associated with enhanced Δ¹⁴C variability in a band centered around the 11-year Schwabe cycle from CE 1450 to 1479 and between CE 1545 and 1578, whereas little 11-year variability is observed from CE 1479 to 1539. In contrast, we only observe enhanced 11-year variability after the end of the Maunder Minimum at CE 1722–1744, which could indicate that the nature and origin of the two minima were different.

Original language	English
Journal	Geophysical Research Letters
Volume	46
Issue	15
Pages (from-to)	8617-8623
Number of pages	7
ISSN	0094-8276
DOIs	https://doi.org/10.1029/2019GL083537
Publication status	Published - 2019

Keywords

grand solar minimum
Maunder Minimum
radiocarbon
solar variability
Spörer Minimum
tree rings

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2019GL083537Final published version, 1.08 MBLicence: CC BY

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title = "Variations in Solar Activity Across the Sp{\"o}rer Minimum Based on Radiocarbon in Danish Oak",

abstract = "Several aspects concerning the origin and nature of grand solar minima remain unclear, and more high-resolution 10Be and 14C records are needed to improve our understanding of these phenomena. Here, we report 137 new high-precision, annually resolved radiocarbon concentrations based on oak from the Danish dendrochronology. The new record covers a period (CE 1432–1578) that encompasses most of the penultimate grand solar minima known as the Sp{\"o}rer Minimum. A detailed comparison between the Sp{\"o}rer and Maunder (CE 1640–1720) minima shows that the Sp{\"o}rer Minimum is associated with enhanced Δ14C variability in a band centered around the 11-year Schwabe cycle from CE 1450 to 1479 and between CE 1545 and 1578, whereas little 11-year variability is observed from CE 1479 to 1539. In contrast, we only observe enhanced 11-year variability after the end of the Maunder Minimum at CE 1722–1744, which could indicate that the nature and origin of the two minima were different.",

keywords = "grand solar minimum, Maunder Minimum, radiocarbon, solar variability, Sp{\"o}rer Minimum, tree rings",

author = "A. Fogtmann-Schulz and Kudsk, {S. G.K.} and Trant, {P. L.K.} and C. Baittinger and C. Karoff and J. Olsen and Knudsen, {M. F.}",

year = "2019",

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language = "English",

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pages = "8617--8623",

journal = "Geophysical Research Letters",

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Variations in Solar Activity Across the Spörer Minimum Based on Radiocarbon in Danish Oak. / Fogtmann-Schulz, A.; Kudsk, S. G.K.; Trant, P. L.K. et al.
In: Geophysical Research Letters, Vol. 46, No. 15, 2019, p. 8617-8623.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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AU - Kudsk, S. G.K.

AU - Trant, P. L.K.

AU - Baittinger, C.

AU - Karoff, C.

AU - Olsen, J.

AU - Knudsen, M. F.

PY - 2019

Y1 - 2019

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AB - Several aspects concerning the origin and nature of grand solar minima remain unclear, and more high-resolution 10Be and 14C records are needed to improve our understanding of these phenomena. Here, we report 137 new high-precision, annually resolved radiocarbon concentrations based on oak from the Danish dendrochronology. The new record covers a period (CE 1432–1578) that encompasses most of the penultimate grand solar minima known as the Spörer Minimum. A detailed comparison between the Spörer and Maunder (CE 1640–1720) minima shows that the Spörer Minimum is associated with enhanced Δ14C variability in a band centered around the 11-year Schwabe cycle from CE 1450 to 1479 and between CE 1545 and 1578, whereas little 11-year variability is observed from CE 1479 to 1539. In contrast, we only observe enhanced 11-year variability after the end of the Maunder Minimum at CE 1722–1744, which could indicate that the nature and origin of the two minima were different.

KW - grand solar minimum

KW - Maunder Minimum

KW - radiocarbon

KW - solar variability

KW - Spörer Minimum

KW - tree rings

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

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Variations in Solar Activity Across the Spörer Minimum Based on Radiocarbon in Danish Oak

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Keywords

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Studies of Cosmic-Ray Events and Grand Solar Minima using Radiocarbon in Tree Rings

Variations in Solar Activity Across the Sporer Minimum Based on Radiocarbon in Danish Oak (dataset)

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