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A two-wave dynamo model was recently proposed by Zharkova et al. (2015, Zh15henceforth), which aims at long-term predictions of solar activity formillennia ahead and backwards. Here we confront the backward model predictionsfor the last 800 years with known variability of solar activity, using bothdirect sunspot observations since 1610 and reconstructions based on cosmogenicradionuclide data. We show that the Zh15 model fails to reproduce thewell-established features of the solar activity evolution during the lastmillennium. This means that the predictive part for the future is not reliableeither.

A two-wave dynamo model by Zharkova et al. (2015) disagrees with data on long-term solar variability