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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: mekhaldi f. Nat Commun. 2022 Mar 7;13(1):1196. doi: 10.1038/s41467-022-28804-9. Nat Commun. 2022. PMID: 35256613 Free PMC article.
Multiradionuclide evidence for an extreme solar proton event around 2,610 B.P. (∼660 BC).
O'Hare P, Mekhaldi F, Adolphi F, Raisbeck G, Aldahan A, Anderberg E, Beer J, Christl M, Fahrni S, Synal HA, Park J, Possnert G, Southon J, Bard E; ASTER Team; Muscheler R. O'Hare P, et al. Among authors: mekhaldi f. Proc Natl Acad Sci U S A. 2019 Mar 26;116(13):5961-5966. doi: 10.1073/pnas.1815725116. Epub 2019 Mar 11. Proc Natl Acad Sci U S A. 2019. PMID: 30858311 Free PMC article.
Timing and climate forcing of volcanic eruptions for the past 2,500 years.
Sigl M, Winstrup M, McConnell JR, Welten KC, Plunkett G, Ludlow F, Büntgen U, Caffee M, Chellman N, Dahl-Jensen D, Fischer H, Kipfstuhl S, Kostick C, Maselli OJ, Mekhaldi F, Mulvaney R, Muscheler R, Pasteris DR, Pilcher JR, Salzer M, Schüpbach S, Steffensen JP, Vinther BM, Woodruff TE. Sigl M, et al. Among authors: mekhaldi f. Nature. 2015 Jul 30;523(7562):543-9. doi: 10.1038/nature14565. Epub 2015 Jul 8. Nature. 2015. PMID: 26153860 Free article.