Eleven-year cycle in solar rotation and meridional motions as derived from the positions of sunspot groups

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Abstract
Using recurrent sunspot groups of more than a hundred years published by Greenwich Observatory it is shown that the 11-yr oscillation found spectroscopically by Howard & LaBonte in the differential rotation of the Sun can also be traced in the longitudinal and latitudinal motions of sunspots. The velocities of both motions are found to be of the same order of magnitude, a few m s−1, i.e. a few times the velocity of displacement of the sunspot zones.

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