1. Transformation of MHD waves in sunspots and simulation of HMI level1 data Konstantin Parchevsky, Sebastien Couvidat, Richard Wachter, Alexander Kosovichev Stanford University LoHCo Workshop, Stanford University, February 08-09, 2011

4. TD for Lsource = 6 Mm

7. TD for Lsource = 12 Mm

9. Simulated I+V, I-V profiles A B C

10. Magnetic field lg  = -2.2 HMI algorithm

11. Magnetic field strength vs. line shape pixel A B C line C 786.09 28.11 17.18 B 787.77 27.84 17.29 A 828.53 29.40 18.26

12. Reconstructed wavefield lg  = -2.2 H = 50 km from the line

13. Conclusion  MHD wave transformation can be seen in velocity components parallel and perpendicular to the magnetic field lines. Transformation exists even in case when the source is initially located completely outside of the magnetic region.  We simulated artificial HMI level 1 data from a given numerically simulated velocity field using 1D LTE radiative transfer SPINOR code.  Magnetic and velocity fields, reconstructed from these artificial data, show good agreement with the model data taken from the height of about 280 km above  =1 level.