Time-Distance Helioseismology and Helioseismic Holography

Stanford, CA

   July 20-22, 2009

The traditional summer workshop on Time-Distance Helioseismology and Acoustic Holography will be held on July 20-22, 2009, 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 20

9:30 - 11:45
Session 1. SDO/JSOC Development and Coordinated SDO Projects (chair: Jesper Schou)

Rick Bogart (Stanford) - JSOC/DRMS Development
Todd Hoeksema (Stanford) - HMI Magnetic Field Observations and Data Products
Margit Haberreiter (LASP, University of Colorado) - UV/EUV Spectral Synthesis
                        and Forecasting
Mark Cheung (LMSAL) - SDO Knowledgebase

2:00 - 5:30
Session 2. Numerical Simulations and Helioseismology Testing (chair: Konstantin Parchevsky)

Mark Cheung (LMSAL) - Simulations of Emerging Flux
Bob Stein (MSU) - New Magneto-Convection Simulations
Irina Kitiashvili (CTR, Stanford) - Realistic MHD Simulations of the Evershed Effect
Thomas Hartlep (Stanford) - Full-Sun Acoustic Wave Simulations for Generating
            Artificial Helioseismic Data
Junwei Zhao (Stanford) - Helioseismic Travel-Time Shifts Caused by Subsurface
            Sound-Speed Perturbations: Comparing Measurements
            from Numerical Simulation Data and Acoustic Ray
            Theory Expectations

Tuesday, July 21

9:00 - 12:30
Session 3. Oscillation Physics (chair: Aaron Birch)

Guenter Houdek (University of Vienna) - Stochastic Mode Excitation
Ana Cristina Cadavid (CSU Northridge) - Sources and Transmission of High Frequency
        Waves in the Solar Photosphere and Chromosphere

Session 4. Sunspot Seismology.I (chair: Aaron Birch)

Ming-Hsu Yang (National Tsing Hua University, Taiwan) - Spatial Distributions of
         Absorption, Local Suppression, and Emissivity Reduction
        of Acoustic Waves in Magnetic Regions
Stathis Ilonidis/Junwei Zhao (Stanford) - Measuring Sunspot's Absorption and
        Emissivity Reduction Coefficients

2:00 - 5:30
Session 5. Sunspot seismology.II (chair: Thomas Hartlep)

Charlie Lindsey (NWRA) - Seismic Discrimination of Thermal and Magnetic Anomalies
            in Axisymmetric Sunspot Umbrae
Junwei Zhao (Stanford) - Observing Interactions Between Helioseismic Waves and Sunspots
Konstantin Parchenvsky (Stanford) - Numerical Simulation of Propagation and Transformation
             of MHD Waves in Various Models of Sunspots

Session 6. Temporal Variations  (chair: Thomas Hartlep)

Olga Burtseva (NSO) - Temporal Variations of High-Degree p-modes in the Quiet Sun
Cristina Rabello-Soares (Stanford) - Solar Cycle Variation of Sound Speed
            in the Solar Interior

Wednesday, July 22

9:00 - 12:30
Session 5. Theory and Data Analysis Methods (chair: Guenter Houdek)

Brian Schlottmann (Stanford) - A Functional Analytic Approach to Helioseismic
                Frechet Kernels
Sebastien Couvidat (Stanford) - Helioseismic Travel-Time Definitions and Sensitivity
            to Horizontal Flows Obtained from Simulations of Solar Convection
Tom Duvall (NASA/GSFC) - Comparison of Time-distance and Holography Techniques
Alexander Kosovichev (Stanford) - Limits on Momentum and Energy of Sunquakes
Aaron Birch (NWRA) - TBD

2:00 - 5:00
Session 6. New Ideas and Discussion (Chair: Charlie Lindsey)

Douglas Gough (University of Cambridge) - Ultraoxymoronic Local Seismology

Open Discussion


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