Abstract

This report documents the assessment of the influence of variations in solar activity on climate. First, the literature on proposed mechanism between UV-radiation and stratospheric ozone and interactions by way of cosmic ray variations is outlined, followed by a brief report on correlations between solar activity and climate. Solar forcings are then compared with other sources of natural variability, in particular El Ni6o and volcanic eruptions. Finally, the impact of these three sources of natural variability on global mean temperatures is analysed using a simple atmosphere-ocean climate model and statistical techniques.