Time-Distance Helioseismology and Helioseismic Holography

Stanford, CA

   August 6-9, 2007

The traditional summer workshop on Time-Distance Helioseismology and Acoustic Holography will be held on August 6-9, 2007, at Stanford, CA. The main goal of the workshop is to discuss the recent progress in the time-distance and holography techniques, new results, perspectives and plans for analysis of SDO/HMI, SOHO/MDI, Hinode/SOT, and GONG data.

Among the topics for discussion are: theoretical and empirical models of sensitivity kernels; testing measurements and inversion techniques with realistic numerical simulations and wave propagation models; wave interaction with magnetic fields; effects of non-uniform excitation and damping; feature kernels and diagnostics of small-scale structures; high-frequency waves and atmospheric seismology; sunquake seismology; solar-cycle effects; large-scale and meridional flows; structure and dynamics of active regions; diagnostics of emerging magnetic flux; tachocline and far-side imaging; calibration of Doppler measurements; initial helioseismology results from Hinode; status and plans of data analysis software development for the HMI data analysis pipeline.

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, August 6

9:30 - 12:30

 Session 1. Observations of oscillations and waves
  in magnetic regions and quiet Sun. I.

 P. Rajaguru - Propagating waves in sunspot penumbra; flows vs.
  signatures of propagating waves in travel times
 S. Couvidat - Ring-like structures in travel-time maps of sunspots
 R. Wachter - Generalized definition of the Dopplergram observation
  height of a filtergraph instrument like MDI or HMI
 T. Duvall - Wave interaction with magnetic elements

2:00 - 5:30

 Session 2. Numerical simulations. I.
 R. Stein - Status of 96 Mm wide by 20 Mm deep simulations
 D. Georgobiani - Data for helioseismology testing
 L. Jacoutot - Turbulence models and wave excitaion
 T. Hartlep - Global wave simulations

Tuesday, August 7

9:30 -12:30

 Session 3.  Observations of oscillations and waves
  in magnetic regions and quiet Sun. II.

 A. Birch - Supergranulation
 T. Sekii - Helioseismology from Hinode
 K. Nagashima - Observation of sunspot oscillations from Hinode
 C. Rabello-Soares - Frequency variation due to solar cycle and magnetic field

2:00- 5:30

 Session 4. Numerical simulations. II.

 M. Cheung - Magnetic flux emergence: Photospheric and sub-surface evolution
 S. Hanasoge - Linear wave modeling
 K. Parchevsky - Direct and indirect magnetic effects
 J. Zhao - Use of simulation data in helioseismic validation and enhancement

Wednesday, August 8

 Session 5. Time-Distance and Holography Methods and Data Analyses

9:30 - 12:30

 A. Birch - Born-approximation kernels
 O. Burtseva - Dispersion and lifetime effects
 S. Kholikov - Meridional flow measurements from GONG
 J. Zhao - Magnetic effects in time-distance helioseismology
 Session 6. HMI data analysis pipeline

2:00- 5:30

 P. Scherrer - HMI status and plans
 A. Kosovichev - Plan for HMI time-distance pipeline
 A. Amezcua - HMI Data Record Management System (DRMS) and analysis pipeline
 J. Zhao - Demonstration codes for the HMI TD pipeline

Thursday, August 9

 Session 7. Far-side and deep interior imaging

9:30 - 12:30
 I. Gonzalez Hernadez - Calibration of the far-side seismic holography signal
 J. Zhao - Far-Side and Tachocline Imaging by Time-Distance Technique
 D. Gough - Physics of the Tachocline

 Session 8. Novel techniques and ideas

2:00 - 4:00
 M. Woodard - Progress with Forward Modeling
 D. Chou - Acoustic Holograms of Sunspots
 A. Kosovichev - Oscillations and waves excited by flares

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