Synchronized helicity oscillations: a link between planetary tides and the solar cycle?

Abstract

Recent years have seen an increased interest in the question of whether the gravitational action of planets could have an influence on the solar dynamo. Without discussing the observational validity of the claimed correlations, we ask for a possible physical mechanism that might link the weak planetary forces with solar dynamo action. We focus on the helicity oscillations that were recently found in simulations of the current-driven, kink-type Tayler instability, which is characterized by an m=1 azimuthal dependence. We show how these helicity oscillations can be resonantly excited by some m=2 perturbation that reflects a tidal oscillation. Specifically, we speculate that the 11.07 years tidal oscillation induced by the Venus--Earth--Jupiter system may lead to a 1:1 resonant excitation of the oscillation of the alpha-effect. Finally, in the framework of a reduced, zero-dimensional alpha--Omega dynamo model we recover a 22.14-year cycle of the solar dynamo.

18 pages, 7 figures, accepted by Solar Physics

References in corpus (9)

• The case for a distributed solar dynamo shaped by near-surface shear
• On magnetic instabilities and dynamo action in stellar radiation zones
• Empirical evidence for a celestial origin of the climate oscillations and its implications
• Solar activity forecast with a dynamo model
• Tidally driven dynamos in a rotating sphere
• The complex planetary synchronization structure of the solar system
• Breakdown of chiral symmetry during saturation of the Tayler instability
• Destabilization of rotating flows with positive shear by azimuthal magnetic fields
• Subcritical excitation of the current-driven Tayler instability by super-rotation

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