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Daily measurements of field strengths and polarities (dots) from (a) MWO, (Pevtsov et al., 2019a) (b) CrAO, and (c) Pulkovo Observatory. Blue color dots correspond to the Potsdam observations, which have been digitized to date (1945, 1954–1956). Red vertical dashed lines mark approximate time of solar minima. Periods corresponding to solar cycles 15–18 and 23–24 are marked in panels b and c.
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