Testing Helioseismic-Holography Inversions for Supergranular Flows Using Synthetic Data
arXiv:1211.6886 · doi:10.1007/s11207-012-0189-0
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.
22 pages, 12 figues, accepted for publication in Solar Physics
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Cited by in corpus (11)
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- Comparison of solar surface flows inferred from time--distance helioseismology and coherent structure tracking using HMI/SDO observations
- Additional Evidence Supporting a Model of Shallow, High-Speed Supergranulation
- Full Waveform Inversion of Solar Interior Flows
- The Quest to Understand Supergranulation and Large-Scale Convection in the Sun
- Full Waveform Inversion for Time-Distance Helioseismology
- Helioseismic holography of simulated sunspots: magnetic and thermal contributions to travel times
- Pinsker estimators for local helioseismology
- Probabilistic Inversions for Time-Distance Helioseismology
- Iterative inversion of synthetic travel times successful at recovering sub-surface profiles of supergranular flows
- Validating Forward Modeling and Inversions of Helioseismic Holography Measurements