Tree-rings reveal two strong solar proton events in 7176 and 5259 BCE
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H. Synal | C. Paleari | T. Pichler | L. Wacker | I. Usoskin | M. Christl | C. Schlüchter | H. Leuschner | M. Salzer | P. Fonti | D. Nievergelt | C. Pearson | K. Nicolussi | R. Muscheler | R. Hantemirov | F. Adolphi | Florian Mekhaldi | David M Brown | N. Brehm | A. Bayliss | Alexandra Bayliss | C. Schlüchter