1. Near-surface simulations of the acoustic field Konstantin Parchevsky Stanford University, HEPL

2. Brief description of the code 1. Equations: linearized 3D Euler equations with force or pressure sources. 2. Background model: convectively stabilized JCD + Vernazza & Avrett chromosphere (N 2 >0). 3. Numerical scheme: Semidiscrete, strong-stability- preserving Runge-Kutta time advancing scheme with spatial filtering. 4. Spatial discretization: dispersion-relation-preserving high- order scheme with stable consistent boundary conditions with summation-by-parts properties. 5. Boundary conditions: non-reflecting boundary conditions based on perfectly matching (PML) layer.

7. Power maps (observations)

8. Power maps (simulations)

9. Future plans 1. Produce artificial data for estimation of accuracy of the inversion procedure of helioseismic data. 2. Simulate interaction of acoustic field from multiple sources with a sunspot (change the background model). 3. Calculate the Green’s functions for point dipole source and sensitivity kernels for multiple sources and compare them with Aaron’s ones. 4. Include magnetic field and background flows.