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The Antarctic region in which severe ozone depletion has taken place is knownas the ozone hole. This region has two basic indicators: the area, where theozone abundance is low (size), and the quantity of ozone mass deficit (depth).The energetic particles that penetrate deeply into the atmosphere and galacticcosmic rays (GCR) modify the ozone abundance in the stratosphere. With thisresearch project, we are looking for evidence of a connection betweenvariations in the cosmic ray flux and variations in the size of the ozone hole.In addition, we are looking for signs of the kind of processes that physicallyconnect GCR fluxes with variations in the stratospheric ozone hole size (OHS)in the Antarctic region. With this goal in mind, we also analyze here theatmospheric temperature (AT) anomalies, which have often been linked with suchvariations. Using Morlet's wavelet spectral analysis to compute the coherencebetween two time series, we found that during the analyzed period (1982-2005),there existed a common signal of around 3 and 5 years between the OHS and GCRtime series, during September and November, respectively. In both cases, therelationship showed a time-dependent anti-correlation between the two series.On the other hand, for October the analysis showed a time-dependent correlationthat occurs around 1.7 years. These results seem to indicate that there existat least two kinds of modulation processes of GCR fluxes on the OHS that worksimultaneously but that change their relative relevance along the timeline.

The influence of cosmic rays on the size of the Antarctic Ozone Hole