Testing Helioseismic-Holography Inversions for Supergranular Flows Using Synthetic Data

D. E. Dombroski, A. C. Birch, D. C. Braun, Shravan Hanasoge

    Research output: Contribution to journalArticle

    Abstract

    Supergranulation is one of the most visible length scales of solar convection and has been studied extensively by local helioseismology. We use synthetic data computed with the Seismic Propagation through Active Regions and Convection (SPARC) code to test regularized-least squares (RLS) inversions of helioseismic-holography measurements for a supergranulation-like flow. The code simulates the acoustic wavefield by solving the linearized three-dimensional Euler equations in Cartesian geometry. We model a single supergranulation cell with a simple, axisymmetric, mass-conserving flow. The use of simulated data provides an opportunity for direct evaluation of the accuracy of measurement and inversion techniques. The RLS technique applied to helioseismic-holography measurements is generally successful in reproducing the structure of the horizontal-flow field of the model supergranule cell. The errors are significant in horizontal-flow inversions near the top and bottom of the computational domain as well as in vertical-flow inversions throughout the domain. We show that the errors in the vertical velocity are due largely to cross talk from the horizontal velocity.

    Original languageEnglish (US)
    Pages (from-to)361-378
    Number of pages18
    JournalSolar Physics
    Volume282
    Issue number2
    DOIs
    StatePublished - Jan 1 2013

    Fingerprint

    holography
    inversions
    convection
    helioseismology
    mass flow
    cells
    flow field
    flow distribution
    acoustics
    geometry
    propagation
    inversion
    evaluation
    code

    Keywords

    • Helioseismology, direct modeling
    • Helioseismology, inverse modeling
    • Interior, convection zone
    • Supergranulation
    • Velocity fields, interior
    • Waves, propagation

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Testing Helioseismic-Holography Inversions for Supergranular Flows Using Synthetic Data. / Dombroski, D. E.; Birch, A. C.; Braun, D. C.; Hanasoge, Shravan.

    In: Solar Physics, Vol. 282, No. 2, 01.01.2013, p. 361-378.

    Research output: Contribution to journalArticle

    Dombroski, D. E. ; Birch, A. C. ; Braun, D. C. ; Hanasoge, Shravan. / Testing Helioseismic-Holography Inversions for Supergranular Flows Using Synthetic Data. In: Solar Physics. 2013 ; Vol. 282, No. 2. pp. 361-378.
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