Time-Distance Helioseismology and Helioseismic Holography

Stanford, CA

   July 28-31, 2008

The traditional summer workshop on Time-Distance Helioseismology and Acoustic Holography will be held on July 28-31, 2008, at Stanford, CA. The main goal of this informal workshop is to discuss the recent progress in the time-distance helioseismology, acoustic imaging  and holography techniques, theoretical interpretation of new results, realistic numerical simulations, perspectives and plans for analysis of SDO/HMI, SOHO/MDI, Hinode/SOT, and GONG data.

Among the topics for discussion are:

The workshop will take place in the conference room (102/103) in the new Astrophysics Building at Stanford. The directions and hotel information are available at .


Monday, July 28

9:30 - 12:30

Session 1. Observations of emerging active regions
            and far-side imaging

 A.Birch - Intro to the LWS TR&T emerging active regions project. Summary of CoRA near-side effort
 S. Zharkov - Time distance analysis of emerging Active Region NOAA 10790
 I.Gonzalez Hernandez - Improving the signal in the far-side magnetic activity maps
 C. Lindsey - Farside imaging

2:00 - 5:30

 Session 2. Magnetic properties of emerging flux and tachocline

 A.Kosovichev - Analysis of AR10488
 Y. Li - Solar Magnetic Field and Activity of AR10923 and AR10930
 B. Welsch - Importance of time-averaged Doppler shifts in active regions
 J. Zhao/T.Hartlep - Imaging Solar Tachocline Using Numerical Simulation and MDI Data

Tuesday, July 29

9:30 -12:30

 Session 3.  New analysis methods. I

 D.-Y. Chou - Absorption of Acoustic Waves in Sunspots
 T. Duvall - Horizontal oscillation signals, spatial variations of the velocity gain, and vertical flow in supergranules
                  -  MPS results
 A. Birch - Ridge filters

2:00- 5:30

 Session 4. Numerical simulations.

 D. Georgobiani - Data for helioseismology testing
 A. Wray/A. Kosovichev - Realistic MHD simulations
 T. Hartlep - Global wave simulations
 K. Parchevsky - Numerical Simulation of Helioseismic MHD Waves: Inclined Magnetic Field Effect

Wednesday, July 30

9:30 - 12:30

Session 5. New analysis methods. II

 C. Lindsey - Seismic Discrimination of Thermal and Magnetic Anomalies in Sunspots
 S. Couvidat - Magnetic flux, umbral temperature, and the origin of the sound-speed perturbations below sunspots
 M. Woodard - Helioseismic detection of mesogranular-scale convection

2:00- 5:30

 Session 6. HMI data analysis pipeline

 A. Amezcua - HMI Data Record Management System (DRMS) and analysis pipeline
 S. Couvidat - Travel-time measurements
 K. Parchevski - Sensitivity kernels
 T. Duvall - Error estimates
 J. Beck - Gaps and noise
 A. Kosovichev - Inversions
 R. Bogart - Ring diagrams pipeline

Thursday, July 31

9:30 - 12:30

 Session 7. New analysis methods. III

 C. Lindsey - The need for an understanding of departures from adiabatic acoustics in the
shallow subphotosphere and above.
R. Wachter -  Helioseismic observations in different absorption lines
 O. Burtseva - Effect of surface activity on amplitudes of high-degree solar p-modes
 I. Kitiashvili- Application of data assimilation methods

 2:00 - 4:00

 Session 8. General discussion. Novel techniques and ideas

 S. Ilonidis - A new scheme for far-side imaging
D. Gough - The solar abundance problem

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