Possible variations in atmospheric ozone related to the eleven year solar cycle

Several plausible, mechanisms linking the hypothesized ozone variations with the solar cycle are reviewed and variation in solar UV flux is proposed as a possible mechanism. The effects of solar UV flux variability on the ozone record to date is examined with emphasis on measurements made at 40 km where both the variability, and chlorine increases due to past fluorocarbon releases should have their greatest effects. A time dependent model is used which includes a full set of chlorine chemistry reactions and can be operated in a mode which calculates temperature self-consistency. Results differ from those calculated with a model which does not consider chlorine chemistry.