Tree-rings reveal two strong solar proton events in 7176 and 5259 BCE.
Brehm N, Christl M, Knowles TDJ, Casanova E, Evershed RP, Adolphi F, Muscheler R, Synal HA, Mekhaldi F, Paleari CI, Leuschner HH, Bayliss A, Nicolussi K, Pichler T, Schlüchter C, Pearson CL, Salzer MW, Fonti P, Nievergelt D, Hantemirov R, Brown DM, Usoskin I, Wacker L.
Brehm N, et al. Among authors: christl m.
Nat Commun. 2022 Mar 7;13(1):1196. doi: 10.1038/s41467-022-28804-9.
Nat Commun. 2022.
PMID: 35256613
Free PMC article.