Reconstruction of Wolf sunspot numbers on the basis of spectral characteristics and estimates of associated radio flux and solar wind parameters for the last millennium

A reconstruction of sunspot numbers for the last 1000 years was obtained us ing a sum of sine waves derived from spectral analysis of the time series o f sunspot number R-z for the period 1700-1999. The time series was decompos ed in frequency levels using the wavelet transform, and an iterative regres sion model (ARIST) was used to identify the amplitude and phase of the main periodicities. The 1000-year reconstructed sunspot number reproduces well the great maximums and minimums in solar activity, identified in cosmonucli des variation records, and, specifically, the epochs of the Oort, Wolf, Spo rer, Maunder, and Dalton Minimums as well the Medieval and Modern Maximums. The average sunspot number activity in each anomalous period was used in l inear equations to obtain estimates of the solar radio flux F-10.7, solar w ind velocity, and the southward component of the interplanetary magnetic fi eld.