Seismic constraints on interior solar convection

Shravan Hanasoge, Thomas L. Duvall, Marc L. DeRosa

    Research output: Contribution to journalArticle

    Abstract

    We constrain the velocity spectral distribution of global-scale solar convective cells at depth using techniques of local helioseismology. We calibrate the sensitivity of helioseismic waves to large-scale convective cells in the interior by analyzing simulations of waves propagating through a velocity snapshot of global solar convection via methods of time-distance helioseismology. Applying identical analysis techniques to observations of the Sun, we are able to bound from above the magnitudes of solar convective cells as a function of spatial convective scale. We find that convection at a depth of r/R = 0.95 with spatial extent ℓ < 20, where ℓ is the spherical harmonic degree, comprises weak flow systems, on the order of 15 m s-1 or less. Convective features deeper than r/R = 0.95 are more difficult to image due to the rapidly decreasing sensitivity of helioseismic waves.

    Original languageEnglish (US)
    JournalAstrophysical Journal Letters
    Volume712
    Issue number1 PART 2
    DOIs
    StatePublished - Jan 1 2010

    Fingerprint

    helioseismology
    convection
    cells
    sensitivity
    spherical harmonics
    sun
    simulation
    method
    distribution
    analysis

    Keywords

    • Convection
    • Hydrodynamics
    • Sun: helioseismology
    • Sun: interior
    • Sun: oscillations
    • Waves

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Seismic constraints on interior solar convection. / Hanasoge, Shravan; Duvall, Thomas L.; DeRosa, Marc L.

    In: Astrophysical Journal Letters, Vol. 712, No. 1 PART 2, 01.01.2010.

    Research output: Contribution to journalArticle

    Hanasoge, Shravan ; Duvall, Thomas L. ; DeRosa, Marc L. / Seismic constraints on interior solar convection. In: Astrophysical Journal Letters. 2010 ; Vol. 712, No. 1 PART 2.
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