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The periodically varying Lorentz force of the periodic solar magnetic fieldgenerated by the solar dynamo can induce two kinds of motions: torsionaloscillations and periodic variations in the meridional circulation.Observational evidence now exists for both these kinds of motions. We discussour ongoing effort in theoretically studying the variations of the meridionalcirculation. Then we present our theoretical model of torsional oscillations,which addresses the question why these oscillations start before sunspot cyclesat latitudes higher than where sunspots are seen.

Back-reactions of dynamo-generated magnetic fields: Torsional oscillations and variations in meridional circulation