LWS Workshop

Local Helioseismology: Data Analysis, Modeling and Comparisons

Tucson, Arizona

   March 27 - 30, 2012

The goal of the workshop is to discuss recent advances and new problems in the exploration of the structure and dynamics of the solar interior.  The workshop will focus on the analysis of common helioseismology data sets and shared artificial simulation data, on the verification and testing of local helioseismology results, on improving the data analysis and inversion methods.  The HMI instrument of NASA's Solar Dynamics Observatory (SDO) mission is providing a large amount of high-resolution helioseismic data, which are complemented by the ground-based GONG helioseismology network. 

Two Carrington rotations (CR 2100 and CR 2104) and two active regions (AR 11092 and 11093) have been selected for comparison.  In addition, the workshop will focus on systematics (B angle, center-to-limb variation, etc.).  These systematics will have to be understood and taken into  account in order to make progress with the evolution of active regions and large-scale flows determined with local helioseismic techniques.  The third focus topic of the workshop is the analysis of artificial data for magnetic regions and deep interior, which will help to validate helioseismic techniques. New observational and theoretical approaches (e.g. wave-form tomography, multi-wave length helioseismology, seismology of sunspots and emerging active regions, physics of solar oscillations, sunquakes etc.) will be also discussed at the workshop.

The workshop will be hosted by the GONG team at the National Solar Observatory.  For further information about the workshop, please, contact Rudi Komm (rkomm@nso.edu) or Alexander Kosovichev (sasha@sun.stanford.edu).

Workshop agenda

, March 27, Morning

8:30 -  9:00 Breakfast

  9:00 -  9:15 Rudi Komm and Libby Petrick
                Housekeeping, setting up remote conferencing

    Session 1: Data Processing and Analysis

9:15 -  9:45  Rick Bogart
                JSOC and HMI Ring-Diagram Pipeline Status Report

  9:45 - 10:00 Junwei Zhao
                HMI Time-Distance Helioseismology Pipeline - Status and Data Products

 10:00 - 10:30  Junwei Zhao
                Comparing Different Inversion Results from HMI Time-Distance Pipeline
                and Comparing Results from Time-Distance and Ring-Diagram Pipelines

 10:30 - 10:45 Coffee break

    Session 2: Large-Scale Flows

10:45 - 11:15 Tom Duvall
        A New Paradigm for Supergranulation Derived from Large-Distance
                Time-Distance Helioseismology: Pancakes

 11:15 - 11:45 Thomas Hartlep
    Helioseismic Measurements of Subsurface Meridional Flows Using Artificial Data

 11:45 - 12:15 Rudi Komm
    Large-Scale Flows From HMI Using the Ring-Diagram Pipeline

 12:15 -  1:30 Lunch

, March 27, Afternoon

    Session 3: Active Regions

1:30 - 2:00 Charles Baldner
    The Sub-Surface Structure of a Large Sample of Active Regions

 2:00 - 2:30 Sushanta Tripathy
    Local Helioseismology of Sunspot Regions

 2:30 - 3:00   Deborah Haber

 3:00 - 3:30 Coffee break

 3:30 - 4:00 Alexander Kosovichev
    Time-Distance Helioseismology Analysis of Active Regions

 4:00 - 4:30 Dean-Yi Chou
    Phenomenological Study of Interaction Between
    Solar Acoustic Waves and Sunspots from Measured Scattered
 4:30 - 5:00    Discussion: Comparison and Verification of Local Helioseismology Data

, March 28, Morning

8:30 - 9:00 Breakfast

    Session 4: Flare Seismology

9:00 - 9:30 Larisza Krista
    The 2 and 2.5 Dimensional Analysis of Sub-Photospheric Flow
                Properties of Flaring Active Regions
  9:30 - 10:00 Alexander Kosovichev
    Comparison of Time-Distance and Holography Analyses of
                Sunquake Observations from HMI

 10:00 - 10:30 Charlie Lindsey
    Prospects in Flare Seismology

 10:30 - 11:00 Coffee break

    Session 5: Emerging Magnetic Flux
11:00 - 11:30 Stathis Ilonidis
      Time-Distance Measurements of Emerging Magnetic Flux

 11:30 - 12:00 Shukur Kholikov
       On Detection of Emerging Active Regions

 12:00 -  1:30 Lunch

, March 28, Afternoon

    Session 6: Helioseismology Techniques

1:30 -  2:00 Benjamin Greer
    Comparison of Local Helioseismology Ring-Fitting Techniques

 2:00 -  2:30 Bradley Hindman
    Using Synthetic Ring-Analysis Spectra to Gauge the Effects of
                Apodization on Measured Mode Parameters
 2:30 - 3:00 Brian Schlottmann
    The Extension of Time-Distance Helioseismology to Probe the Solar Interior
    from the Near-Surface to the Center

 3:00 -  3:30 Coffee break

 3:30 -  4:00 Konstantin Parchevsky
    Verification of the Travel Time Measurement Technique and
                the Helioseismic Inversion Procedure for Sound Speed Using
                Artificial Data
 4:00 -  5:00 Discussion: New Helioseismology Techniques.
                Verification and Testing

, March 29, Morning

8:30-  9:00 Breakfast

    Session 7: Mode Physics

9:00 - 9:30 Rachel Howe
    Multi-Wavelength Helioseismology: Power and Phase Maps in an Active Region

  9:30 - 10:00 Kiran Jain
    Multi-Wavelength Helioseismology: Acoustic Mode Parameters in Quiet Regions

 10:00 - 10:30 Coffee break

 10:30 - 11:00 Irina Kitiashvili
    Properties and Characterization of Acoustic Events Detected in
                Realistic Simulations and Observations

 11:00 - 11:30 Konstantin Parchevsky
    Estimation of Contribution of the Magnetic Field and Background Variations
                of the Sound Speed to the MHD wave Propagation Speed in Different
                Models of Sunspots.

 11:30 - 12:00 Jason Jackiewicz and G. Vigeesh
    Seismology of Small-Scale Magnetic Features From Simulations

 12:00 -  1:30 Lunch

, March 29, Afternoon

1:30 - 2:30 Discussion: Magnetic Field Effects

 3:00 - 4:30 University of Arizona Mirror Lab Tour (90 minutes)

Friday, March 30, Morning

    Session 8: Working Group Meetings

8:30 - 9:00  Breakfast

  9:00 - 10:30
  1) Comparison of Local Helioseismology Techniques and Results
  2) Detection of Emerging Magnetic Flux
  3) Individual Collaborations

 10:30 - 11:00 Coffee break

 11:00 - 12:00 Discussion and future plans

 12:00 -  1:30 Lunch

Travel Support

Domestic travel support will be available for qualified scientists. If you are interested in obtaining financial support, please submit an abstract, and send a 1-page CV and a request letter to Haruko Makitani (makitani@stanford.edu).

Air Transport

Tucson International Airport

Ground Transport

Arizona Stagecoach http://www.azstagecoach.com


Airport Hotels - many to choose from - see map at


Area Hotels (distance from NSO)

Most hotels range between $119 to $150; government rate is $103

Windmill Suites - St Philips Plaza
4250 N Campbell 4 miles

Towneplace Suites Marriott - Williams Centre

384 South Williams Blvd 5.3 miles

Four Points by Sheraton
1900 E Speedway .76 miles

Sheraton Tucson Hotel & Suites
5151 E Grant Road 5 miles

Radisson Suites Tucson
6555 E Speedway Blvd 5.72 miles

Comfort Suites at Sabino Canyon
7007 E Tanque Verde 7.5 miles

Doubletree by Hilton Hotel Tucson - Reid Park
445 S Alvernon Way 3.51 miles

Lodge on the Desert
306 N Alvernon Way 3.19 miles

Holiday Inn Express - Tucson Mall
620 E Wetmore Road 4.56 miles


Parking is very limited at our location, therefore, you should plan to park at one of two University of Arizona parking garages - 1) Second Street Garage or 2) Cherry Avenue Garage. Fee is $8 per day. If you have any questions about visitor parking at the UA, please contact UA Parking and Transportation at (520) 621-3710. (Click here for a campus parking map)