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Prediction of solar cycle is an important goal of Solar Physics both becauseit serves as a touchstone for our understanding of the sun and also because ofits societal value for a space faring civilization. The task is difficult andprogress is slow. Schatten et al. (1978) suggested that the magnitude of themagnetic field in the polar regions of the sun near solar minimum could serveas a precursor for the evolution and amplitude of the following solar cycle.Since then, this idea has been the foundation of somewhat successfulpredictions of the size of the last four cycles, especially of the unexpectedlyweak solar cycle 24 ("the weakest in 100 years"). Direct measurements of thepolar magnetic fields are available since the 1970s and we have just passed thesolar minimum prior to solar cycle 25, so a further test of the polar fieldprecursor method is now possible. The predicted size of the new cycle 25 is128$\pm$10 (on the new sunspot number version 2 scale), slightly larger thanthe previous cycle.

Prediction of Solar Cycle 25