Helioseismic Evidence That the Solar Dynamo Originates near the Tachocline

TL;DR

This study uses helioseismic data to provide evidence that the solar dynamo likely originates near the tachocline, a deep layer at the base of the convection zone, rather than near the surface.

Contribution

The paper presents helioseismic analysis linking rotation gradients and magnetic activity patterns to support a deep-seated dynamo near the tachocline.

Findings

Rotation gradient exhibits butterfly-like behavior near the tachocline

Magnetic butterfly diagram correlates with rotation gradient patterns

Supports a deep or throughout convection zone dynamo, not shallow

Abstract

The exact location of the solar dynamo remains uncertain--whether it operates primarily in the near-surface shear layer, throughout the entire convection zone, or near the tachocline, a region of sharp transition in the solar rotation, located at the base of the convection zone, approximately 200,000 km beneath the surface. Various studies have supported each of these possibilities. Notably, the solar magnetic "butterfly" diagram and the pattern of zonal flows ("torsional oscillations") exhibit strikingly similar characteristics, suggesting a link between magnetic field evolution and solar flows. Since magnetic fields cannot be measured directly in the deep solar interior, torsional oscillations and rotation gradients are employed as diagnostic proxies. Our analysis reveals that the gradient of rotation displays "butterfly"-like behavior near the tachocline, which is similar to the magnetic butterfly diagram at the surface. This result supports the idea that the solar dynamo has a deep-seated origin, likely operating either near the tachocline or throughout the convection zone, thereby disfavoring the recent scenario of a shallow, near-surface dynamo. This finding may also have important implications for understanding how stellar dynamos operate in general.