Does a Spin–Orbit Coupling Between the Sun and the Jovian Planets Govern the Solar Cycle?
I. R. G. Wilson A , C , B. D. Carter B and I. A. Waite B A Education Queensland, Toowoomba, QLD 4350, Australia B Centre for Astronomy, Solar Radiation and Climate, University of Southern Queensland, Toowoomba, QLD 4350, Australia C Corresponding author. Email: irgeo@ozemail.com.au Abstract We present evidence to show that changes in the Sun’s equatorial rotation rate are synchronized with changes in its orbital motion about the barycentre of the Solar System. We propose that this synchronization is indicative of a spin–orbit coupling mechanism operating between the Jovian planets and the Sun. However, we are unable to suggest a plausible underlying physical cause for the coupling. Some researchers have proposed that it is the period of the meridional flow in the convective zone of the Sun that controls both the duration and strength of the Solar cycle. We postulate that the overall period of the meridional flow is set by the level of disruption to the flow that is caused by changes in
