Comparison of solar surface flows inferred from time--distance helioseismology and coherent structure tracking using HMI/SDO observations

Abstract

We compare measurements of horizontal flows on the surface of the Sun using helioseismic time--distance inversions and coherent structure tracking of solar granules. Tracking provides 2D horizontal flows on the solar surface, whereas the time--distance inversions estimate the full 3-D velocity flows in the shallow near-surface layers. Both techniques use HMI observations as an input. We find good correlations between the various measurements resulting from the two techniques. Further, we find a good agreement between these measurements and the time-averaged Doppler line-of-sight velocity, and also perform sanity checks on the vertical flow that resulted from the 3-D time--distance inversion.

22 pages of the manuscript, 5 figures, 3 tables, accepted for publication in the Astrophysical Journal

References in corpus (14)

• Anomalously Weak Solar Convection
• Linear Sensitivity of Helioseismic Travel Times to Local Flows
• High-resolution mapping of flows in the solar interior: Fully consistent OLA inversion of helioseismic travel times
• Local helioseismology and correlation tracking analysis of surface structures in realistic simulations of solar convection
• Solar supergranulation revealed by granule tracking
• Tracking granules on the Sun's surface and reconstructing horizontal velocity fields: I. the CST algorithm
• Helioseismology challenges models of solar convection
• Comparison of large-scale flows on the Sun measured by time-distance helioseismology and local correlation tracking technique
• Subsurface Supergranular Vertical Flows as Measured Using Large Distance Separations in Time-Distance Helioseismology
• Large-scale horizontal flows in the solar photosphere I: Method and tests on synthetic data
• Comparison of solar horizontal velocity fields from SDO/HMI and Hinode data
• Testing Helioseismic-Holography Inversions for Supergranular Flows Using Synthetic Data
• Inversions for Average Supergranular Flows Using Finite-frequency Kernels
• Tracking granules at the Sun's surface and reconstructing velocity fields. II. Error analysis

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