Climate Science Seminar Speaker: Peter Stauning, Danish Meteorological Institute, Copenhagen, Denmark Time: Tuesday, 15 November at 14:15 Place: 1531-119 (Aud-D2) Title: Solar activity-climate relations: A different approach Abstract: The presentation of solar activity-climate relations is extended with the most recent solar activity and temperature data series. The extension of data series shows clearly that the forcing of terrestrial temperatures is dominated by sources different from solar activity after ~1985. Based on analyses of data series for the years 1850-1985 it is demonstrated that apart from a single-period sinusoidal excursion in Earth's temperatures between ~1923 and 1965 there is a strong correlation between solar activity and terrestrial temperatures delayed by 3 years, which complies with basic causality principles. The smoothing of climate parameters (e.g. solar cycle length) is critically examined. The cosmic ray-cloud climate model is found inadequate. It is suggested that the in-cycle variations and also the longer term variations in global temperatures over the examined 160 years are mainly caused by corresponding changes in the total solar irradiance level representing the energy output from the core, but further modulated by varying energy transmission properties in the active outer regions of the Sun. Christoffer Karoff