Left image: evolution of the area of the 1999 sunspot (upper panel); the wavelet power spectrum for a white noise background, the cone of influence is marked as a cross-hatched area where edge effects become imporant and the contour lines show the 95% confidence level (lower left panel). Global (integrated in time) wavelet power spectrum, where the dashed line shows the 95% confidence limit (lower right panel). Right image: the same as the left image but for the mean intensity of the 1999 sunspot.