Astrophysical Journal
Astrophysical Journal
5 years ago

The Effect of Toroidal Magnetic Fields on Solar Oscillation Frequencies

The Effect of Toroidal Magnetic Fields on Solar Oscillation Frequencies
Solar oscillation frequencies change with the level of magnetic activity. Localizing subsurface magnetic field concentrations in the Sun with helioseismology will help us to understand the solar dynamo. Because the magnetic fields are not considered in standard solar models, adding them to the basic equations of stellar structure changes the eigenfunctions and eigenfrequencies. We use quasi-degenerate perturbation theory to calculate the effect of toroidal magnetic fields on solar oscillation mean multiplet frequencies for six field configurations. In our calculations, we consider both the direct effect of the magnetic field, which describes the coupling of modes, and the indirect effect, which accounts for changes in stellar structure due to the magnetic field. We limit our calculations to self-coupling of modes. We find that the magnetic field affects the multiplet frequencies in a way that depends on the location and the geometry of the field inside the Sun. Comparing our the...

Publisher URL: http://iopscience.iop.org/0004-637X/854/1/74

DOI: 10.3847/1538-4357/aaa3f7

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