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D.Sokoloff, Long-term dynamics of solar cycle, geomagnetic reversals and fluctuations of dynamo governing parameters, European Geoscience Union, General Assembly, Vienna, 2012, EGU2012-1514, p.1514).
As a matter of fact, cyclic behavior of solar activity demonstrates a dynamics on the timescales which are much longer then the cycle period. From the other hand, magnetostratigraphic timescale shows a complicated long-term evolution of geomagnetic field on the timescales which are much longer then the presumed geodynamo timescale. A model which relate such phenomena with random variations of alpha-effect (or other governing mean-field dynamo parameters) is suggested.
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