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At present, Babcock-Leighton flux transport solar dynamo models appear as themost promising model for explaining diverse observational aspects of thesunspot cycle. The success of these flux transport dynamo models is largelydependent upon a single-cell meridional circulation with a deep equatorwardcomponent at the base of the Sun's convection zone. However, recentobservations suggest that the meridional flow may in fact be very shallow(confined to the top 10 % of the Sun) and more complex than previously thought.Taken together these observations raise serious concerns on the validity of theflux transport paradigm. By accounting for the turbulent pumping of magneticflux as evidenced in magnetohydrodynamic simulations of solar convection, wedemonstrate that flux transport dynamo models can generate solar-like magneticcycles even if the meridional flow is shallow. Solar-like periodic reversals isrecovered even when meridional circulation is altogether absent, however, inthis case the solar surface magnetic field dynamics does not extend all the wayto the polar regions. Very importantly, our results demonstrate that theParker-Yoshimura sign rule for dynamo wave propagation can be circumvented inBabcock-Leighton dynamo models by the latitudinal component of turbulentpumping -- which can generate equatorward propagating sunspot belts in theabsence of a deep, equatorward meridional flow. We also show that variations inturbulent pumping coefficients can modulate the solar cycle amplitude andperiodicity. Our results suggest the viability of an alternate magnetic fluxtransport paradigm -- mediated via turbulent pumping -- for sustainingsolar-stellar dynamo action.

A proposed paradigm for solar cycle dynamics mediated via turbulent pumping of magnetic flux in Babcock-Leighton type solar dynamos