===  Validating Time-Distance Helioseismology Results by Use of Numerical Simulations ===
===== Junwei Zhao =====
===== Stanford University =====

 . Authors: Junwei Zhao^1^, Alexander G. Kosovichev^1^, Robert F. Stein^2^, Dali Georgobiani^2^, Ake Nordlund^3^, Thomas Hartlep^4^, and Nagi N. Mansour^4^

    . ^1^ W.W.Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA94305-4085
    . ^2^ Department of Physics and Astronomy, Michigan State University, East Lansing, MI48824
    . ^3^ Niels Bohr Institute, Copenhagen University, DK-2100 Copenhagen, Denmark
    . ^4^ NASA Ames Research Center, Mailstop 230-2, Moffett Field, CA94035

 . Because helioseismology is to derive solar properties that cannot be directly observed, to examine helioseismology techniques on numerically simulated data is essentially an effective way to validate these techniques. By use of realistic numerical simulation of solar convections in small scales, i.e., 96Mm in horizontal dimension and 20 Mm in vertical dimension, we have demonstrated that time-distance can satisfactorily invert flow fields up to 8 Mm or so into the interior. By use of numerical simulation of solar acoustic wavefields in global scales, we have validated the time-distance far-side imaging technique. We also demonstrate that with the help of numerical simulations, we are able to image acoustic structures in the solar tachocline area, a crucial area for solar dynamo operations.
 
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