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Geophysicae Prediction of solar activity on the basis of ...
www.ann-geophys.netsunspot number E. Echer1, N. R. Rigozo1,2, D. J. R. Nordemann1, and L. E. A. Vieira1 1Instituto Nacional de Pesquisas Espaciais (INPE), Av. Astronautas, ... in a reconstruction and a prediction of solar activity for cycles 23 and 24. 2 Sunspot data and spectral analysis methods 2.1 Sunspot data The annual averages of the sunspot number were ...