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

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.

arXiv commentaccepted for publication in RAA (Res. Astron. Astrophys.)

References in corpus (19)

• Low Temperature Opacities
• Element Diffusion in the Solar Interior
• Solar activity forecast with a dynamo model
• Full--Sphere Simulations of a Circulation--Dominated Solar Dynamo: Exploring the Parity Issue
• Surface flux transport modeling for solar cycles 15--21: effects of cycle-dependent tilt angles of sunspot groups
• Reconciling solar and stellar magnetic cycles with nonlinear dynamo simulations
• Modeling Solar Cycles 15 to 21 Using a Flux Transport Dynamo
• A Revised Prescription for the Tayler-Spruit Dynamo: Magnetic Angular Momentum Transport in Stars
• Is the current lack of solar activity only skin deep?
• Solar Cycle Related Changes at the Base of the Convection Zone
• Solar Activity Phases and Intermediate-degree Mode Frequencies
• Starspots, Stellar Cycles and Stellar Flares: Lessons from Solar Dynamo Models
• Measurements of solar irradiance and effective temperature as a probe of solar interior magnetic fields
• Solar Magnetic Field Signatures in Helioseismic Splitting Coefficients
• Solar Models with Revised Abundance
• Solar Cycle Variations of p-Mode Frequencies
• Variations in High Degree Acoustic Mode Frequencies of the Sun during Solar Cycle 23 and 24
• Changes in the sensitivity of solar p-mode frequency shifts to activity over three solar cycles
• The Meridional Circulation of the Sun: Observations, Theory and Connections with the Solar Dynamo