Validating Time-Distance Helioseismology With Realistic Quiet Sun Simulations

Abstract

Linear time-distance helioseismic inversions are carried out for vector flow velocities using travel times measured from two $\sim 100^2\mathrm{M}{\mathrm{m}}^2\times 20\mathrm{Mm}$ realistic magnetohydrodynamic quiet-Sun simulations of about 20 hr. The goal is to test current seismic methods on these state-of-the-art simulations. Using recent three-dimensional inversion schemes, we find that inverted horizontal flow maps correlate well with the simulations in the upper $\sim 3$ Mm of the domains for several filtering schemes, including phase-speed, ridge, and combined phase-speed and ridge measurements. In several cases, however, the velocity amplitudes from the inversions severely underestimate those of the simulations, possibly indicating nonlinearity of the forward problem. We also find that, while near-surface inversions of the vertical velocites are best using phase-speed filters, in almost all other example cases these flows are irretrievable due to noise, suggesting a need for statistical averaging to obtain better inferences.

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Cited by in corpus (16)

• Meridional Flow in the Solar Convection Zone II: Helioseismic Inversions of GONG Data
• Supergranulation and multiscale flows in the solar photosphere: Global observations vs. a theory of anisotropic turbulent convection
• Inversions for Deep Solar Meridional Flow Using Spherical Born Kernels
• Flows around Averaged Solar Active Regions
• Full Waveform Inversion of Solar Interior Flows
• Sensitivity Kernels for Flows in Time-Distance Helioseismology: Extension to Spherical Geometry
• Helioseismic Investigation of Modeled and Observed Supergranule Structure
• Time-Distance Helioseismology of Two Realistic Sunspot Simulations
• A Helioseismic Survey of Near-surface Flows Around Active Regions and their Association with Flares
• Issues with time--distance inversions for supergranular flows
• Combined helioseismic inversions for 3D vector flows and sound-speed perturbations
• Probabilistic Inversions for Time-Distance Helioseismology
• Validating Forward Modeling and Inversions of Helioseismic Holography Measurements
• Iterative inversion of synthetic travel times successful at recovering sub-surface profiles of supergranular flows
• Validation of Spherical Born Approximation Sensitivity Functions for Measuring Deep Solar Meridional Flow
• Comparison of time-distance inversion methods applied to SDO/HMI Dopplergrams