GONG data and pipelines: Present

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GONG data and pipelinesPresent future
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Present data products

• 800x800 full-disk images, one per minute,
  continuous (0.87 average duty cycle)
• Observables Doppler velocity, intensity,
  magnetic field
• Merged velocity images
• Spherical harmonic time series up to l 150
• Tracked remapped dense pack data cubes
• Global mode parameters on 108-day basis
• Ring fit parameters and inversions
• Farside images every 12 hours
• Near-real time 10-min average magnetograms

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10-min average near-real-time magnetogram
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GONG data cube for AR10486
Quarter-day averages
LOS B
Velocity
5-min power
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Farside imaging and frontside activity
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Network Status
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Future data products

• Calibrated farside images
• High-degree time series and global mode
  parameters
• Merged magnetograms
• Custom data cubes
• Near-real-time magnetic synoptic maps
• Better global and ring parameters
• Travel time and difference maps

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Future instrumental upgrades

• Just completed magnetogram modulator upgrade
  (June 2006)
• Near-real-time data delivery of all data (Farside
  now running)
• Newer, better cameras (but same spatial
  resolution) (FY2008?)
• Image destretching before summation to reduce
  seeing (not easy)
• Second spectral line (?) (even less easy)
• What else does the community want?

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Current pipelines - Reduction

• Read tapes
• Automatically reject bad images
• Calibration for V, I, B
• Geometry and MTF estimation
• Angular registration using noon drift scans, MDI,
  and planetary transits

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Current pipelines global modes

• Spherical harmonic transform
• Time series merge
• Peakfind

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Current pipeline - rings

• Merge velocity images (input for all local
  pipelines)
• Track and remap
• Compute power spectra
• Fits rings
• Perform inversion

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Current pipeline - farside

• At sites
• Perform calibration
• Remove bad images
• Resample velocity to 200x200
• Send to Tucson
• At Tucson
• Remap images
• Perform 2x2 and 1x3 skip analysis
• Construct farside map
• Place on web

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Current user access

• DSDS (Data Storage and Distribution System)
  interface
• Being upgraded for local helioseisology searches

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Future pipelines

• Magnetogram production
• Scale fields between sites
• Merge magnetograms
• Produce synoptic maps
• Should be completed by end of year
• Time-distance pipeline
• Produce phase-speed filter images
• Produce cross-correlation maps
• Produce travel-time measurements
• Development starts after completion of
  magnetogram pipeline

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Future data access

• Integration of helioseismology products (time
  series, mode parameters, data cubes, flow maps,
  etc.) into Virtual Solar Observatory
• Calibrated site images available in VSO via
  Stanford now

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VSO Top-Level Interface
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VSO Shopping Cart
Carts are permanently stored, retrievable, and
citable searches can be replicated.
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VSO API
Provides link between VSO and other systems
IDL/SolarSoft, COSEC, EGSO, HelioScope,
AstroGrid, Aladin, VO.
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What is available to HELAS?

• All data products
• All code, pending approval from original authors
  (not expected to be a problem)
• Documentation

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http//gong.nso.edu/data/DMAC_documentation/
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The future

• GONG instruments are aging and will eventually
  need to be replaced.
• SDO will not last forever.
• Is Solar Orbiter a comprehensive helioseismology
  program?
• What does the community want to do next?
• How will it be funded?
• It can take a long time to get the next big thing
  going (typically 10-15 years in the US)
• Suggest we start to seriously plan for the
  post-GONG and post-SDO era now.
• We are willing to host a planning meeting in
  Tucson