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A Single-Year Cosmic Ray Event at 5410 BCE Registered in C of Tree Rings.
Geophys Res Lett
June 2021
Laboratory for Ion Beam Physics ETH Zürich Zürich Switzerland.
The annual C data in tree rings is an outstanding proxy for uncovering extreme solar energetic particle (SEP) events in the past. Signatures of extreme SEP events have been reported in 774/775 CE, 992/993 CE, and ∼660 BCE. Here, we report another rapid increase of C concentration in tree rings from California, Switzerland, and Finland around 5410 BCE.
View Article and Find Full Text PDFMultiradionuclide evidence for an extreme solar proton event around 2,610 B.P. (∼660 BC).
Proc Natl Acad Sci U S A
March 2019
Department of Geology-Quaternary Sciences, Lund University, 22362 Lund, Sweden;
Recently, it has been confirmed that extreme solar proton events can lead to significantly increased atmospheric production rates of cosmogenic radionuclides. Evidence of such events is recorded in annually resolved natural archives, such as tree rings [carbon-14 (C)] and ice cores [beryllium-10 (Be), chlorine-36 (Cl)]. Here, we show evidence for an extreme solar event around 2,610 years B.
View Article and Find Full Text PDFSolar superstorm of AD 774 recorded subannually by Arctic tree rings.
Nat Commun
August 2018
Finnish Museum of Natural History, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland.
Recently, a rapid increase in radiocarbon (C) was observed in Japanese tree rings at AD 774/775. Various explanations for the anomaly have been offered, such as a supernova, a γ-ray burst, a cometary impact, or an exceptionally large Solar Particle Event (SPE). However, evidence of the origin and exact timing of the event remains incomplete.
View Article and Find Full Text PDFLarge 14C excursion in 5480 BC indicates an abnormal sun in the mid-Holocene.
Proc Natl Acad Sci U S A
January 2017
Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, Japan.
Radiocarbon content in tree rings can be an excellent proxy of the past incoming cosmic ray intensities to Earth. Although such past cosmic ray variations have been studied by measurements of C contents in tree rings with ≥10-y time resolution for the Holocene, there are few annual C data. There is a little understanding about annual C variations in the past, with the exception of a few periods including the AD 774-775 C excursion where annual measurements have been performed.
View Article and Find Full Text PDFCauses of an ad 774-775 14C increase.
Nature
November 2012
Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA.
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