Recent variability of the solar spectral irradiance and its impact on climate modelling by Ermolli, I, Matthes, K, Wit, d, Krivova, N, Tourpali, K, Weber, M, Unruh, Y, Gray, L, Langematz, U, Pilewskie, P, Rozanov, E, Schmutz, W, Shapiro, A, Solanki, S, Woods, T