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(A) Time series of magnetic energy (blue) and the toroidal magnetic field at mid-latitude and at R = 0.7 R⊙ (red). (B) Time series of smoothed full-cycle amplitude Ak (see text for definition). The gray shading corresponds to the time span plotted in (A). The red and green dots represent cycles higher and lower (respectively) than the Ak-threshold chosen to delineate epochs of strong and normal mode of dynamo operation. The choice of threshold value is based on a break in the slope of the |Ak| histogram, plotted in (C). Panels D and E show histograms of strong mode durations and inter-event waiting times, equivalent to the duration distribution for normal dynamo operation.
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