Validating Helioseismic Imaging Techniques using 3D Global-Sun Simulations of Helioseismic Wave Propagation

Details Validating Helioseismic Imaging Techniques using 3D Global-Sun Simulations of Helioseismic Wave Propagation Validating Helioseismic Imaging Techniques using 3D Global-Sun Simulations of Helioseismic Wave Propagation

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.s32a..05h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #S32A-05

Astronomy and Astrophysics

Astrophysics

[7522] Solar Physics, Astrophysics, And Astronomy / Helioseismology

Scientific paper

Significant advancements in our understanding of the interior structure and dynamics of the Sun have been made by studying solar oscillation. Waves, randomly excited by the vigorous convective flows near the solar surface, propagate through the interior where they are affected by inhomogeneities such as flows and local temperature variations. Local helioseismology tries to infer the properties of these inhomogeneities by analyzing the observed waves field near the solar photosphere. In general, such inferences are based on more or less simplified models of wave propagation in the Sun. For correct interpretation of helioseismic measurements and for testing and validating inversion techniques, numerical simulation of wave propagation play a crucial role. We present result from testing various local helioseismology techniques using numerical simulation of wave propagation in global-Sun models. Our simulation code solves the time-dependent linearized wave propagation problem in a full spherical model and takes into account mass flows as well as sound speed variations. We present results from testing time-distance helioseismology far-side imaging and imaging of the solar tachocline, results from with active regions and subsurface regions, differential rotation, and meridional flows. Datasets are available for download at the included URL.

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