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      Testing Helioseismic-Holography Inversions for Supergranular Flows Using Synthetic Data

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          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.

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          Time–distance helioseismology

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            Time‐Distance Helioseismology: The Forward Problem for Random Distributed Sources

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              Motions in the Sun at the Photospheric Level IV. The Equatorial Rotation and Possible Velocity Fields in the Photosphere

              A Hart (1954)
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                Author and article information

                Journal
                29 November 2012
                Article
                10.1007/s11207-012-0189-0
                1211.6886
                eb8c2715-9a82-478f-a6ff-4b86644454fd

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                22 pages, 12 figues, accepted for publication in Solar Physics
                astro-ph.SR

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