Local Helioseismology: Three-Dimensional Imaging of the Solar Interior

By Laurent Gizon, A. Birch, H. Spruit. 2010

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The Sun supports a rich spectrum of internal waves that are continuously excited by turbulent convection. The Global Oscillation Network Group (GONG) network and the SOHO/MDI (Solar and Heliospheric Observatory/Michelson Doppler Imager) space instrument provide an exceptional database of spatially resolved observations of solar oscillations, covering more than an entire sunspot cycle (11 years). Local helioseismology is a set of tools for probing the solar interior in three dimensions using measurements of wave travel times and local mode frequencies. Local helioseismology has discovered (a) near-surface vector flows associated with convection, (b) 250 m s−1 subsurface horizontal outflows around sunspots, (c) ∼50 m s−1 extended horizontal flows around active regions (converging near the surface and diverging below), (d) the effect of the Coriolis force on convective flows and active region flows, (e) the subsurface signature of the 15 m s−1 poleward meridional flow, (f) a ±5 m s−1 time-varying depth-depen...

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/143ffd8cab9ad794b95cdba306ebf1aa80f50ab7

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In Astronomy and Astrophysics

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DETECTION OF EQUATORWARD MERIDIONAL FLOW AND EVIDENCE OF DOUBLE-CELL MERIDIONAL CIRCULATION INSIDE THE SUN (2013, methodology): “This analysis technique has already providedrich information about the solar interior structures and dynamics (Gizon et al. 2010).”