Figure 1.

Top plot: two principal components (PCs) of solar background magnetic field (blue and green curves, arbitrary numbers) obtained for cycles 21–23 (historic data) and predicted for cycles 24–26 using the mathematical formulae derived from the historical data (from the data by Zharkova et al. [1]). The bottom plot: The summary curve derived from the two PCs above for the “historical” data (cycles 21–23) and predicted for solar cycle 24 (2008–2019), cycle 25 (2020–2031), cycle 26 (2031–2042) (from the data by Zharkova et al. [1]).