In Maunder Minimum, poleward migration rate of magnetic fields was about 0.7 m/s and solar cycle length was about 20 yrs.
V. I. Makarov & A. G. Tlatov:  http://www.ias.ac.in/jarch/jaa/21/193-196.pdf

Vukcevic: geomagnetic data : Jackson & Bloxham

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