Reconstruction of total solar irradiance 1974–2009 W. T. Ball, Y. C. Unruh, N. A. Krivova, S. Solanki, T. Wenzler, D. J. Mortlock and A. H. Jaffe A&A, 541 (2012) A27 Published online: 23 April 2012 DOI: 10.1051/0004-6361/201118702