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Multiradionuclide evidence for the solar origin of the cosmic-ray events of AD 774/5 and 993/4
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2015 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 6, 8611Article in journal (Refereed) Published
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Abstract [en]

The origin of two large peaks in the atmospheric radiocarbon (C-14) concentration at AD 774/5 and 993/4 is still debated. There is consensus, however, that these features can only be explained by an increase in the atmospheric C-14 production rate due to an extraterrestrial event. Here we provide evidence that these peaks were most likely produced by extreme solar events, based on several new annually resolved Be-10 measurements from both Arctic and Antarctic ice cores. Using ice core Cl-36 data in pair with Be-10, we further show that these solar events were characterized by a very hard energy spectrum with high fluxes of solar protons with energy above 100MeV. These results imply that the larger of the two events (AD 774/5) was at least five times stronger than any instrumentally recorded solar event. Our findings highlight the importance of studying the possibility of severe solar energetic particle events.

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2015. Vol. 6, 8611
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SWEDARCTIC 2002, NordGRIP 2002
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URN: urn:nbn:se:polar:diva-2875DOI: 10.1038/ncomms9611ISI: 000364934200013PubMedID: 26497389OAI: oai:DiVA.org:polar-2875DiVA: diva2:929755
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Swedish Polar Research Secretariat
Available from: 2016-05-19 Created: 2016-05-19 Last updated: 2016-05-19

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