CAN THE 14C PRODUCTION IN 1055 CE BE AFFECTED BY SN1054?. Issue 5 (18th October 2020)

• Record Type: Journal Article
• Authors: Terrasi, F; Marzaioli, F; Buompane, R; Passariello, I; Porzio, G; Capano, M; Helama, S; Oinonen, M; Nöjd, P; Uusitalo, J; Jull, A J T; Panyushkina, I P; Baisan, C; Molnar, M; Varga, T; Kovaltsov, G; Poluianov, S; Usoskin, I
• Is Part Of: Radiocarbon. Volume 62:Issue 5(2020)
• Page Start: 1403
• Page End: 1418
• Publication Date: 2020-10-18
• Subjects: radiocarbon AMS, -- supernova, -- tree rings; Radiocarbon dating -- Periodicals; 930.1028505
• DOI: 10.1017/RDC.2020.58
• Languages: English
• ISSNs: 0033-8222

Abstract

ABSTRACT: Annually resolved radiocarbon ( 14 C) measurements on tree rings led to the discovery of abrupt variations in 14 C production attributed to large solar flares. We present new results of annual and subannual 14 C fluctuations in tree rings from a middle-latitude sequoia (California) and a high-latitude pine (Finland), analyzed for the period 1030–1080 CE, to trace a possible impact of the Crab supernova explosion, occurring during the Oort minimum of solar activity. Our results indicate an increase of Δ 14 C around 1054/55 CE, which we estimate is higher in magnitude than the cyclic variability due to solar activity at a 2σ significance level. The net signal appears to be synchronized in the studied locations. Several sources of this event are possible including γ-rays from the Crab supernova, an unusually weak solar minimum or a solar energetic particle incident. More data are needed to provide more insight into the origin of this 14 C event.