Long-term variations in global ozone

Monthly mean values of the global (averaged over the Earth’s surface) total ozone content (GO) are constructed on the basis of data of the global ozonometric network from 1964 to 2006, and their trends are calculated. A very strong relationship between the GO and solar activity, in particular, the index F10.7, is detected. This relation considerably exceeds the relation that solar activity has to other meteorological parameters. The unexpectedly strong GO decrease observed from the mid-1970s to the mid-1990s cannot be explained by anthropogenic impact alone.