Abstract
Prograde and retrograde sectoral oscillations of the Sun have been observed so as to determine frequency differences produced by rotation. Oscillations in the frequency range 2.1–3.7 mHz and with spherical harmonic degrees from 1 to 100 have been identified. Average frequency shifts due to rotation in a sidereal reference frame are found to range from a high of ∼660 nHz at degree 1 to a low of ∼423 nHz at degree 6, rising to ∼471 nHz at degree 100. These results indicate that most of the Sun's volume rotates at a rate close to that of the surface, but also that the energy-generating core may rotate more rapidly than the surface.
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Duvall, T., Harvey, J. Rotational frequency splitting of solar oscillations. Nature 310, 19–22 (1984). https://doi.org/10.1038/310019a0
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DOI: https://doi.org/10.1038/310019a0
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