The Medieval and Modern Maximum solar activity imprints in tree ring data from Chile and stable isotope records from Antarctica and Peru

This work presents a study of the relations between solar and climate variations during the last millennia by spectral and multi-resolution analysis for oxygen-18 and tree ring width time series. The spectral and wavelet analysis of tree ring data shows that main solar cycle periodicities are present in our time series at the 0.95 confidence level. This result suggests the possibility of a solar modulation of climate variations detected in accumulated ice oxygen-18. Results of spectral and wavelet analysis have shown that both solar and climate factors are also recorded in the oxygen-18 data.