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Fig. 12.

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Quantile-quantile (“q-q”) plots to test the similarity of corresponding distributions for the southern and northern hemispheres: (a). for 3-hourly values of aa N and aa S; (b) for the daily means of aa N and aa S , Aa N and Aa S; (c) 3-hourly values of aa HN and aa HS and (d) their daily means Aa HN and Aa HS. The mauve points mark the 90%, 99%, 99.9% and 99.99% percentile points and the orange is for 99.97%. Also shown in blue in part (b) is the 99.7% percentile. Points would lie along the diagonal green line if the distributions from the two hemispheres had the same shape.

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