Sound speed in a random flow and turbulent shifts of the solar eigenfrequencies

Andrei V. Gruzinov

    Research output: Contribution to journalArticle

    Abstract

    Perturbation theory is used to calculate the frequency shift of acoustic modes of a homogeneous turbulent fluid and the frequency shifts of solar modes due to turbulent convection. For sound waves in a random flow, the fractional frequency shift is +(11/30)M2 in the long-wavelength limit, and the shift at short wavelengths is -2/3 M2, where M is the average Mach number of the flow. In our model of solar convection, the low-degree f-mode shift is positive and unobservably small, whereas the fractional frequency shift at high degrees (l ≫ 500) is -M2, where M is the Mach number of convection near the solar surface.

    Original languageEnglish (US)
    Pages (from-to)458-464
    Number of pages7
    JournalAstrophysical Journal
    Volume498
    Issue number1 PART I
    DOIs
    StatePublished - Jan 1 1998

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    Keywords

    • Sun: interior
    • Sun: oscillations
    • Turbulence

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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