Artificial Data for Local Helioseismology

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The key to local helioseismology is the effective application of local seismic diagnostic techniques to determine the structure of the solar interior with the finest possible resolution. The extent and magnitude of the supergranular return flow and the nature of thermal anomalies, flows, and magnetic-field configurations in and near active regions are phenomena on which we hope local helioseismic analyses will shed clear light. We present progress we have made simulating local solar seismic data using magneto-acoustic-gravity (MAG) wave propagation simulations. A highly accurate hybrid pseudo-spectral / B-spline algorithm for MAG-wave simulations is discussed, which decomposes the flow fields into horizontal Fourier and vertical B-spline representations. Time advancement is conducted in horizontal-Fourier / vertical-collocation space using a third-order Runge-Kutta time-stepping algorithm. Sophisticated perfectly matched layer (PML) wave-absorption/radiation boundary conditions are implemented to eliminate unphysical numerical wave reflections. Simulation results for prescribed subsurface anomalies will be presented, along with details of code structure, accuracy, and efficiency.

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