Rieger, Schwabe, Suess-de Vries: The Sunny Beats of Resonance

Abstract We propose a self-consistent explanation of Rieger-type periodicities, the Schwabe cycle, and the Suess-de Vries cycle of the solar dynamo in terms of resonances of various wave phenomena with gravitational forces exerted by the orbiting planets. Starting on the high-frequency side, we show that the two-planet spring tides of Venus, Earth, and Jupiter are able to excite magneto-Rossby waves, which can be linked with typical Rieger-type periods. We argue then that the 11. 07-year beat period of those magneto-Rossby waves synchronizes an underlying conventional - α − Ω -dynamo by periodically changing either the field storage capacity in the tachocline or some portion of the α -effect therein. We also strengthen the argument that the Suess-de Vries cycle appears as an 193-year beat period between the 22. 14-year Hale cycle and a spin-orbit coupling effect related with the 19. 86-year rosette-like motion of the Sun around the barycenter.