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T1  - A Single-Year Cosmic Ray Event at 5410 BCE Registered in C-14 of Tree Rings 
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UR  - http://hdl.handle.net/10138/332663 
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A1  - Miyake, Fusa; Panyushkina, Irina; Jull, Tim; Adolphi, Florian; Brehm, N; Helama, Samuli; Kanzawa, K; Moriya, T; Muscheler, Raimund; Nicolussi, K; Oinonen, Markku; Salzer, M; Takeyama, M; Tokanai, F; Wacker, Lucas 
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Y1  - 2021 
LA  - eng 
AB  - The annual C-14 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 similar to 660 BCE. Here, we report another rapid increase of C-14 concentration in tree rings from California, Switzerland, and Finland around 5410 BCE. These C-14 data series show a significant increase of similar to 6 parts per thousand in 5411-5410 BCE. The signature of C-14 vari... 
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KW  - AD 775; ANNUAL BE-10 DATA; BRISTLECONE-PINE; CHRONOLOGY; DELTA-C-14; INCREASE; MULTIRADIONUCLIDE EVIDENCE; RADIOCARBON; SIGNATURE; SOLAR PROTON EVENT; cosmogenic nuclide; radiocarbon; solar activity; solar energetic particle; tree rings; 1171 Geosciences; 114 Physical sciences 
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