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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