Prediction of solar activity strength for solar cycles 23 and 24 is performed on the basis of extrapolation of sunspot number spectral components. Sunspot number data during 1933-1996 periods (solar cycles 17-22) are searched for periodicities by iterative regression. The periods significant at the 95% confidence level were used in a sum of sine series to reconstruct sunspot series, to predict the strength of solar cycles 23 and 24. The maximum peak of solar cycles is adequately predicted (cycle 21: 158±13.2 against an observed peak of 155.4; cycle 22: 178±13.2 against 157.6 observed). Solar cycle 23 was predicted to have a peak in 2000 with maximum amplitude of 125±13.2, in good agreement with the 119.6 observed. The minimum of solar cycle 23 is predicted to occur around 2007-2008. For solar cycle 24, the maximum is predicted to occur in 2012 (115±13.2) or 2013 (117±13.2) and this shall be a very weak solar cycle. © European Geosciences Union 2004.
CITATION STYLE
Echer, E., Rigozo, N. R., Nordemann, D. J. R., & Vieira, L. E. A. (2004). Prediction of solar activity on the basis of spectral characteristics of sunspot number. Annales Geophysicae, 22(6), 2239–2243. https://doi.org/10.5194/angeo-22-2239-2004
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