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

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 thro...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2021-05, Vol.21 (4), p.95-164
Main Authors: Bi, Shao-Lan, Li, Tan-Da, Liu, Kang, Jiang, Jie, Li, Ya-Guang, Zhang, Jing-Hua, Zhang, Xian-Fei, Wu, Ya-Qian
Format: Article
Language:English
Subjects:
Dynamo theory
Helioseismology
Magnetic fields
Parameters
Solar cycle
Solar interior
Solar magnetic field
Solar models
Sound
Sun: activity
Sun: interior
Sun: oscillations
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Summary: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.
ISSN:1674-4527
DOI:10.1088/1674-4527/21/4/95