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GONG data and pipelines: Present & future

This document outlines the current state and future direction of GONG (Global Oscillation Network Group) data products and pipelines. It covers present data products, including full-disk images, Doppler velocity observables, and advanced merging techniques, as well as plans for future upgrades and enhancements in data delivery and accessibility. The document discusses the integration of helioseismology products into the Virtual Solar Observatory, the importance of community feedback, and the upcoming need for new instruments as current ones age.

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GONG data and pipelines: Present & future

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  1. GONG data and pipelines:Present & future

  2. 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

  3. 10-min average near-real-time magnetogram

  4. GONG data cube for AR10486 Quarter-day averages LOS B Velocity 5-min power

  5. Farside imaging and frontside activity

  6. Network Status

  7. 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

  8. 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?

  9. 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

  10. Current pipelines – global modes • Spherical harmonic transform • Time series merge • Peakfind

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

  12. 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

  13. Current user access • DSDS (Data Storage and Distribution System) interface • Being upgraded for local helioseisology searches

  14. 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

  15. 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

  16. VSO Top-Level Interface

  17. VSO Shopping Cart Carts are permanently stored, retrievable, and citable – searches can be replicated.

  18. VSO API Provides link between VSO and other systems: IDL/SolarSoft, COSEC, EGSO, HelioScope, AstroGrid, Aladin, VO.

  19. What is available to HELAS? • All data products • All code, pending approval from original authors (not expected to be a problem) • Documentation

  20. http://gong.nso.edu/data/DMAC_documentation/

  21. 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

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