Wavelet analysis of the solar ¹⁰Be data using the Morlet wavelet. a) Time series of solar modulation function (Φ) anomalies from unfiltered ¹⁰Be data. b) Wavelet power spectrum: darker contours indicate the higher values of wavelet power. White thin line is the cone of influence, below which edge effects become important. c) Global wavelet power spectrum, i.e., the temporal mean wavelet power at each period. Dashed line is the 95% confidence level. d) Scale-averaged time series for the period band 800 − 1200 years. Dashed line is the 95% confidence level. For more information about wavelet analysis, see Torrence & Compo (1998).