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We studied the presence and spatiotemporal characteristics and evolution ofthe variations in the differential rotation rates and radial magnetic fields inthe Schwabe and Quasi-biennial-oscillation (QBO) timescales. To achieve theseobjectives, we used rotation rate residuals and radial magnetic field data fromthe Michelson Doppler Imager on the Solar and Heliospheric Observatory and theHelioseismic and Magnetic Imager on the Solar Dynamics Observatory, extendingfrom May 1996 to August 2020, covering solar cycles 23 and 24, respectively.Under the assumption that the radial surface magnetic field is non-local andthe differential rotation is symmetric around the equator, our results suggestthat the source region of the Schwabe cycle is confined between$\sim$30$^{\circ}$ N and S throughout the convection zone. As for the sourceregion of the QBO, our results suggest that it is below 0.78R$_{\odot}$.

Causal Interaction between the subsurface rotation rate residuals and radial magnetic field in different timescales