Abstract
The central magnetic field and rotation of the solar radiative zone are responsible for corrections to the g-mode frequencies. Magnetogravitational spectra are calculated analytically in a simple one-dimensional MHD model that goes beyond the WKB approximation and avoid any cusp resonances that trap the wave within the radiative zone in the presence of a weak magnetic background. The calculations are compared with spacecraft observations of the 1% frequency shifts for candidate g-modes found in the SOHO GOLF experiment. The magnetic correction is the main contribution for a strong magnetic field satisfying the approximation used. It is shown that a constant magnetic field of 700 kG in the radiative zone provides the required frequency shift for the n = −10 g-mode. The rotational correction, which is due to the Coriolis force in the one-dimensional model used, is much less than a percent (αΩ ≤ 0.003).
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Original Russian Text © M.S. Dvornikov, T.I. Rashba, V.B. Semikoz, 2008, published in Astronomicheskiĭ Zhurnal, 2008, Vol. 85, No. 4, pp. 376–384.
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Dvornikov, M.S., Rashba, T.I. & Semikoz, V.B. Rotational and magnetic corrections to the g-mode frequencies in a one-dimensional MHD model. Astron. Rep. 52, 335–342 (2008). https://doi.org/10.1134/S1063772908040082
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DOI: https://doi.org/10.1134/S1063772908040082