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dc.contributor.authorJull, A J Timothy
dc.contributor.authorPanyushkina, Irina
dc.contributor.authorMiyake, Fusa
dc.contributor.authorMasuda, Kimiaki
dc.contributor.authorNakamura, Toshio
dc.contributor.authorMitsutani, Takumi
dc.contributor.authorLange, Todd E
dc.contributor.authorCruz, Richard J
dc.contributor.authorBaisan, Chris
dc.contributor.authorJanovics, Robert
dc.contributor.authorVarga, Tamas
dc.contributor.authorMolnár, Mihály
dc.date.accessioned2018-09-06T23:13:53Z
dc.date.available2018-09-06T23:13:53Z
dc.date.issued2018
dc.identifier.citationJull A.J.T., Panyushkina I.P., Miyake F., Masuda K., T. Nakamura, Lange T.E., Cruz R.J., Baisan C., Janovics R., Varga T., Molnár M. 2018. More rapid carbon-14 excursions in the tree-ring record: A record of different kind of solar activity at about 800 BC? Radiocarbon, Selected Papers from the 2nd Radiocarbon in the Environment Conference, Debrecen, Hungary, July 3–7, 2017, doi:10.1017/RDC.2018.53en_US
dc.identifier.issn0033-8222
dc.identifier.issn1945-5755
dc.identifier.doi10.1017/RDC.2018.53
dc.identifier.urihttp://hdl.handle.net/10150/628656
dc.description.abstractTwo radiocarbon (14C) excursions are caused by an increase of incoming cosmic rays on a short time scale found in the Late Holocene (AD 774–775 and AD 993–994), which are widely explained as due to extreme solar proton events (SPE). In addition, a larger event has also been reported at 5480 BC (Miyake et al. 2017a), which is attributed to a special mode of a grand solar minimum, as well as another at 660 BC (Park et al. 2017). Clearly, other events must exist, but could have different causes. In order to detect more such possible events, we have identified periods when the 14C increase rate is rapid and large in the international radiocarbon calibration (IntCal) data (Reimer et al. 2013). In this paper, we follow on from previous studies and identify a possible excur- sion starting at 814–813 BC, which may be connected to the beginning of a grand solar minimum associated with the beginning of the Hallstatt period, which is characterized by relatively constant 14C ages in the period from 800–400 BC. We compare results of annual 14C measurements from tree rings of sequoia (California) and cedar (Japan), and compare these results to other identified excursions, as well as geomagnetic data. We note that the structure of the increase from 813 BC is similar to the increase at 5480 BC, suggesting a related origin. We also assess whether there are different kinds of events that may be observed and may be consistent with different types of solar phenomena, or other explanations.en_US
dc.language.isoenen_US
dc.publisherCambridge Univ Pressen_US
dc.relation.urlhttps://www.cambridge.org/core/product/identifier/S003382221800053X/type/journal_articleen_US
dc.rights© 2018 by the Arizona Board of Regents on behalf of the University of Arizonaen_US
dc.subject14C excursionsen_US
dc.subjectcosmic raysen_US
dc.subjectdendrochronologyen_US
dc.subjectradiocarbon datingen_US
dc.titleMore rapid C14 excursions in the tree-ring record: A record of different kind of solar activity at about 800 BC?en_US
dc.typeArticleen_US
dc.contributor.departmentLaboratory of Tree Ring Research, University of Arizonaen_US
dc.identifier.journalRadiocarbonen_US
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_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleRadiocarbon
dc.source.beginpage1
dc.source.endpage12
refterms.dateFOA2018-09-06T23:13:53Z


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