The lost sunspot cycle: New support from Be10 measurements
It has been suggested that the deficit in the number of spots on the surface of the Sun between 1790 and 1830, known as the Dalton minimum, contained an extra cycle that was not identified in the original sunspot record by Wolf. Though this cycle would be shorter and weaker than the average solar cy...
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ftdatacite:10.48550/arxiv.1412.2931 2023-05-15T16:29:34+02:00 The lost sunspot cycle: New support from Be10 measurements Karoff, C. Inceoglu, F. Knudsen, M. F. Olsen, J. Fogtmann-Schulz, A. 2014 https://dx.doi.org/10.48550/arxiv.1412.2931 https://arxiv.org/abs/1412.2931 unknown arXiv https://dx.doi.org/10.1051/0004-6361/201424927 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences article-journal Article ScholarlyArticle Text 2014 ftdatacite https://doi.org/10.48550/arxiv.1412.2931 https://doi.org/10.1051/0004-6361/201424927 2022-04-01T12:32:01Z It has been suggested that the deficit in the number of spots on the surface of the Sun between 1790 and 1830, known as the Dalton minimum, contained an extra cycle that was not identified in the original sunspot record by Wolf. Though this cycle would be shorter and weaker than the average solar cycle, it would shift the magnetic parity of the solar magnetic field of the earlier cycles. This extra cycle is sometimes referred to as the 'lost solar cycle' or 'cycle 4b'. Here we reanalyse Be10 measurements with annual resolution from the NGRIP ice core in Greenland in order to investigate if the hypothesis regarding a lost sunspot cycle is supported by these measurements. Specifically, we make use of the fact that the Galactic cosmic rays, responsible for forming Be10 in the Earth's atmosphere, are affected differently by the open solar magnetic field during even and odd solar cycles. This fact enables us to evaluate if the numbering of cycles earlier than cycle 5 is correct. For the evaluation, we use Bayesian analysis, which reveals that the lost sunspot cycle hypothesis is likely to be correct. We also discuss if this cycle 4b is a real cycle, or a phase catastrophe, and what implications this has for our understanding of stellar activity cycles in general. : accepted for publication in A&A Text Greenland ice core NGRIP DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences Karoff, C. Inceoglu, F. Knudsen, M. F. Olsen, J. Fogtmann-Schulz, A. The lost sunspot cycle: New support from Be10 measurements |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
description |
It has been suggested that the deficit in the number of spots on the surface of the Sun between 1790 and 1830, known as the Dalton minimum, contained an extra cycle that was not identified in the original sunspot record by Wolf. Though this cycle would be shorter and weaker than the average solar cycle, it would shift the magnetic parity of the solar magnetic field of the earlier cycles. This extra cycle is sometimes referred to as the 'lost solar cycle' or 'cycle 4b'. Here we reanalyse Be10 measurements with annual resolution from the NGRIP ice core in Greenland in order to investigate if the hypothesis regarding a lost sunspot cycle is supported by these measurements. Specifically, we make use of the fact that the Galactic cosmic rays, responsible for forming Be10 in the Earth's atmosphere, are affected differently by the open solar magnetic field during even and odd solar cycles. This fact enables us to evaluate if the numbering of cycles earlier than cycle 5 is correct. For the evaluation, we use Bayesian analysis, which reveals that the lost sunspot cycle hypothesis is likely to be correct. We also discuss if this cycle 4b is a real cycle, or a phase catastrophe, and what implications this has for our understanding of stellar activity cycles in general. : accepted for publication in A&A |
format |
Text |
author |
Karoff, C. Inceoglu, F. Knudsen, M. F. Olsen, J. Fogtmann-Schulz, A. |
author_facet |
Karoff, C. Inceoglu, F. Knudsen, M. F. Olsen, J. Fogtmann-Schulz, A. |
author_sort |
Karoff, C. |
title |
The lost sunspot cycle: New support from Be10 measurements |
title_short |
The lost sunspot cycle: New support from Be10 measurements |
title_full |
The lost sunspot cycle: New support from Be10 measurements |
title_fullStr |
The lost sunspot cycle: New support from Be10 measurements |
title_full_unstemmed |
The lost sunspot cycle: New support from Be10 measurements |
title_sort |
lost sunspot cycle: new support from be10 measurements |
publisher |
arXiv |
publishDate |
2014 |
url |
https://dx.doi.org/10.48550/arxiv.1412.2931 https://arxiv.org/abs/1412.2931 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core NGRIP |
genre_facet |
Greenland ice core NGRIP |
op_relation |
https://dx.doi.org/10.1051/0004-6361/201424927 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1412.2931 https://doi.org/10.1051/0004-6361/201424927 |
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1766019282245779456 |