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is recording, at best, very muted solar activity. Another proposed end date for the maximum is 2007, with the decline phase of Cycle 23. In any case the low solar activity of solar cycle 24 in the 2010s marked a new period of reduced solar activity.
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Rigozo, N. R.; Echer, E.; Vieira, L. E. A.; Nordemann, D. J. R. (2001). "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".
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during the late 1950s and may have ended with the peak of
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