Interaction of MHD Waves with Sunspots

Astronomy and Astrophysics – Astrophysics

Scientific paper

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[7522] Solar Physics, Astrophysics, And Astronomy / Helioseismology, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields

Scientific paper

Understanding of MHD wave propagation, transformation and scattering by sunspots and their interaction with the non-uniform background magnetic field and flows is very important for improving helioseismic inversion procedures. Such simulations also provide artificial data for testitng and calibration techniques used for analysis of data from space missions SOHO/MDI, SDO/HMI, and HINODE. We developed 3D linear MHD code for numerical simulation of excitation and propagation of MHD waves in non-uniform medium in presence of the background magnetic field and flows. We present simulations of MHD wave propagation in magnetostatic and dynamic models of sunspots. We consider separately two cases when the waves are excited by point sources, located at different distances from the spot, and by stochastic noise source. The results are compared with the waveforms of the cross-correlation function extracted from the observational data. We discuss the differences between the models and observations in terms of the amplitude variations and travel-time shifts. Comparison of the simulations with helioseismic observations allows us to test the sunspot and helioseismic models, and suggest improvements. The numerically simulated helioseismic data are publicly accessible for the helioseismic community for testing and verification of various ambient noise imaging techniques of helioseismology (time-distance, holography, and ring diagrams).

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