Solar dynamo model with nonlocal alpha-effect and diamagnetic pumping

Kitchatinov Leonid, kit@iszf.irk.ru, Institute for Solar-Terrestrial Physics, Irkutsk, Russia
Olemskoy Sergey, osv@iszf.irk.ru, Institute for Solar-Terrestrial Physics, Irkutsk, Russia

Abstract
Sunspot data and A-index of global magnetic fields are used to evidence operation of the Babcock-Leighton mechanism on the Sun. Dynamo model is developed that combines a nonlocal alpha-effect of the Babcock-Leighton type and diamagnetic pumping. Computations show that the model is not prone to the catastrophic quenching due to conservation of magnetic helicity. Diamagnetic pumping concentrates magnetic fields to the base of convection zone. The period of magnetic cycle, the equatorial symmetry of the field, its meridional drift, and the polar-to-toroidal field ratio obtained in the model satisfy observational constrains.