Solar activity over nine millennia: A consistent multi-proxy reconstruction C. J. Wu, I. G. Usoskin, N. Krivova, G. A. Kovaltsov, M. Baroni, E. Bard and S. K. Solanki A&A, 615 (2018) A93 Published online: 19 July 2018 DOI: 10.1051/0004-6361/201731892