Variations of helioseismic parameters due to magnetic field generated by a flux transport model

TL;DR

This study investigates how magnetic fields generated by a flux transport dynamo influence helioseismic parameters, particularly the sound speed profile at the base of the solar convection zone, aligning theoretical models with observations.

Contribution

It demonstrates that dynamo-generated magnetic fields can cause cyclic variations in sound speed, matching helioseismic observations during solar cycle 23.

Findings

Magnetic fields cause noticeable changes in sound speed profiles.

Theoretical predictions align with helioseismic data from solar cycle 23.

Dynamo model parameters can be tuned to match observed variations.

Abstract

The change of sound speed has been found at the base of the convection during the solar cycles, which can be used to constrain the solar internal magnetic field. We aim to check whether the magnetic field generated by the solar dynamo can lead to the cyclic variation of the sound speed detected through helioseismology. The basic configuration of magnetic field in the solar interior was obtained by using a Babcock-Leighton (BL) type flux transport dynamo. We reconstructed one-dimensional solar models by assimilating magnetic field generated by an established dynamo and examined their influences on the structural variables. The results show that magnetic field generated by the dynamo is able to cause noticeable change of the sound speed profile at the base of the convective zone during a solar cycle. Detailed features of this theoretical prediction are also similar to those of the helioseismic results in solar cycle 23 by adjusting the free parameters of the dynamo model.