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 H-A, Mekhaldi F, Paleari CI, Leuschner H-H, Bayliss A, Nicolussi K, Pichler T, Schlüchter C, Pearson CL, Salzer MW, Fonti P, Nievergelt D, Hantemirov R, Brown DM, Usoskin I & Wacker L
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Brehm, N., Christl, M., Knowles, T. D. J., Casanova, E., Evershed, R. P., Adolphi, F., … Wacker, L. (2022). Tree-rings reveal two strong solar proton events in 7176 and 5259 BCE. Nature Communications, 13, 1196 (8 pp.). https://doi.org/10.1038/s41467-022-28804-9