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dc.contributor.authorMiyake, Fusa
dc.contributor.authorJull, A. J. Timothy
dc.contributor.authorPanyushkina, Irina P.
dc.contributor.authorWacker, Lukas
dc.contributor.authorSalzer, Matthew
dc.contributor.authorBaisan, Christopher H.
dc.contributor.authorLange, Todd
dc.contributor.authorCruz, Richard
dc.contributor.authorMasuda, Kimiaki
dc.contributor.authorNakamura, Toshio
dc.date.accessioned2017-04-13T16:55:47Z
dc.date.available2017-04-13T16:55:47Z
dc.date.issued2017-01-31
dc.identifier.citationLarge 14C excursion in 5480 BC indicates an abnormal sun in the mid-Holocene 2017, 114 (5):881 Proceedings of the National Academy of Sciencesen
dc.identifier.issn0027-8424
dc.identifier.issn1091-6490
dc.identifier.doi10.1073/pnas.1613144114
dc.identifier.urihttp://hdl.handle.net/10150/623129
dc.description.abstractRadiocarbon content in tree-rings can be an excellent proxy of the past incoming cosmic ray intensities to the Earth. Although such past cosmic ray variations have been studied by measurements of 14C contents in tree rings with ≧10 year time resolution for the Holocene (1), there are few annual 14C data. There is a little understanding about annual 14C variations in the past with the exception of a few periods including the AD774-775 annual 14C excursion (2). Here, we report the result of 14C measurements using the bristlecone pine tree rings for the period from 5490 BC to 5411 BC with 1-2 year resolution, and a finding of an extraordinarily large 14C increase (20‰) from 5481 BC to 5471 BC (the 5480 BC event). The 14C increase rate of this event is much larger than that of the normal Grand Solar Minima. We propose the possible causes of this event are a special phase of grand solar minimum, or a combination of successive solar proton events and a normal grand solar minimum.
dc.description.sponsorshipJapan Society for the Promotion of Science (JSPS) [26887019, 16H06005]; JSPS [G2602]; Toyoaki Scholarship Foundationen
dc.language.isoenen
dc.publisherNATL ACAD SCIENCESen
dc.relation.urlhttp://www.pnas.org/lookup/doi/10.1073/pnas.1613144114en
dc.rightsCopyright © 2016 The Authors. Published by National Academy of Sciences.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectradiocarbonen
dc.subjectcosmic ray eventen
dc.subjectsolar proton eventen
dc.subjectgrand solar minimumen
dc.subjecttree ringsen
dc.titleLarge 14C excursion in 5480 BC indicates an abnormal sun in the mid-Holoceneen
dc.typeArticleen
dc.contributor.departmentDepartment of Geosciences, University of Arizonaen
dc.contributor.departmentArizona Accelerator Mass Spectrometry Laboratory, University of Arizonaen
dc.contributor.departmentLaboratory of Tree Ring Research, University of Arizonaen
dc.identifier.journalProceedings of the National Academy of Sciencesen
dc.description.noteNo embargo.en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal accepted manuscripten
refterms.dateFOA2018-09-11T18:32:01Z
html.description.abstractRadiocarbon content in tree-rings can be an excellent proxy of the past incoming cosmic ray intensities to the Earth. Although such past cosmic ray variations have been studied by measurements of 14C contents in tree rings with ≧10 year time resolution for the Holocene (1), there are few annual 14C data. There is a little understanding about annual 14C variations in the past with the exception of a few periods including the AD774-775 annual 14C excursion (2). Here, we report the result of 14C measurements using the bristlecone pine tree rings for the period from 5490 BC to 5411 BC with 1-2 year resolution, and a finding of an extraordinarily large 14C increase (20‰) from 5481 BC to 5471 BC (the 5480 BC event). The 14C increase rate of this event is much larger than that of the normal Grand Solar Minima. We propose the possible causes of this event are a special phase of grand solar minimum, or a combination of successive solar proton events and a normal grand solar minimum.


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