Originally Posted by rtomes

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The amplitudes of the periods in the sunspots are different to those
in the solar displacement periods. The 11.07, 10.40 and 9.93 year
periods are strong in the sunspots while the 12.78, 13.81 and 8.46
year periods are less strong. By comparing the amplitudes in each,
it can be seen that the sun has resonance with periods near about 10.5
years, but much less so with periods above 12 or below 9 years. This
is a classic example of a system with a natural resonant period.
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