Time variation of the 13-month smoothed monthly total sunspot number (dashed lines) and the cross-equatorial flux transport (solid lines) in each sunspot cycle. The definition of the cross-equatorial flux transport is described in the body text. The cross-equatorial flux transport is smoothed by taking the moving average of 1 year (thin) and 2 years (thick). The dotted lines indicate the timing of the cycle minimum. The minimum in Cycle 24 is assumed to be in 2020.
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