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  • eSDO and the Grid Using the Grid to Enhance UK Access to SDO Data and Algorithms Elizabeth Auden Mullard Space Science Laboratory 19 September 2005
  • The eSDO Project SDO: Solar Dynamic Observatory eSDO: PPARC grant #PP/C502930/1 , funded to provide virtual observatory access to SDO data and algorithms for the UK solar community. Phase A – research: 1 October 2004 – 30 September 2005 Phase B – development: 1 October 2005 – 30 September 2007 Three Goals: 1. Data centres in US and UK 2. Eleven solar algorithms 3. Visualization techniques to navigate huge dataset
  • Background SDO: Solar Dynamic Observatory SDO will launch in August 2008 as part of NASA’s Living With a Star program. Raw data: ~ 2TB / day. AIA: Atmospheric Imaging Assembly – this instrument will provide 10 channels for multi-wavelength observations of the Sun in optical and UV frequencies. HMI: Helioseismic and Magnetic Imager – the magnetic imager will look deep into the Sun’s interior. Scientists will be able to compare a number of magnetic field data products with white light images. WHITE SANDS New Mexico STANFORD California UK data centre SDO Fig. 1: Data flow from satellite to UK data centre
  • Data Centre
    • Data Centres will allow public access to AIA and HMI data.
    • Main data centre: Stanford University / Lockheed Martin
    • Online disc cache of science products (line of sight magnetograms, images of tracked regions of interest, etc)
    • Tape archive of low level products (AIA and HMI filtergrams)
    • Facility to generate high level products on-the-fly
    • UK data centre: currently investigating ATLAS at RAL
      • Online disc cache of UK requested science products
      • Rolling 60 day cache of AIA images
      • “ True” cache of requested HMI products and older AIA data
  • Data Centre with the Grid
    • US Data Centre: access through VSO, Virtual Solar Observatory
    • UK Data Centre: access through AstroGrid and other IVOA compliant virtual observatories
    • UK requests will first check UK disc cache for data in export format.
    • If data is not present, request will be routed through an AstroGrid to VSO interface. User will get a copy, UK disc cache will get a copy
    • Why can’t UK users just use VSO?
    • They can. However, going through AstroGrid has benefits for both the community and individual users:
    • UK cache of request will improve data request speed for event-driven science.
    • Individuals can take advantage of AstroGrid’s facilities for workflows, access to multiple data archives, and algorithmic tool usage.
  • Algorithms
    • Three algorithm categories under UK development:
    • Image and feature recognition (MSSL & RAL)
    • Global helioseismology
    • Local helioseismology
    * Coronal loop recognition * Non-linear magnetic field extrapolation * Helicity computation * Differential Emission Measure (DEM) computation * Small event detection * Coronal Mass Ejection (CME) dimming region recognition * Mode asymmetry analysis * Mode frequency analysis * Perturbation map generation * Subsurface flow analysis * Local helioseismology inversion
  • Algorithms with the Grid
    • Three methods of algorithm distribution:
    • Installation at JSOC pipeline in Stanford University
    • Distribution of IDL wrapped modules through SolarSoft
    • Deployment of AstroGrid web services
    • Minimize data transfer before processing.
    • Modules can be designated as automatic or on-the-fly during pipeline execution
    • Possible access to approved UK users through AstroGrid CEA module on top of pipeline.
    • Provides access to the algorithm code through SolarSoft as used by many in the UK solar community.
    • Host algorithms on UK machine(s) with AstroGrid CEA web service interface
    • Allows integration of algorithms with AstroGrid workflow to all UK users
  • Visualization
    • Three visualization techniques:
    • Development of quicklook products
    • On-the-fly movie and gallery generation
    • Zoom and pan streaming tool
    • Extract thumbnail images and basic metadata from science products
    • Generate catalogues from feature recognition algorithms (coronal loops, small events, CME dimming regions, etc.)
    • Generate thumbnail image gallery from user-delineated input parameters
    • Generate movies from user-delineated input parameters
    • Open line-of-sight magnetogram or AIA image in GUI
    • User can zoom and pan in space, time, and wavelength / magnetic field.
  • Visualization and the Grid
    • Catalogues will be searchable through AstroGrid DSA modules.
    • Gallery and movie GUIs will be accessible through a web browser.
    • The Streaming tool might be tricky.
      • GUI will be web-based
      • Full resolution data products will be streamed in multiple resolutions from the cache nearest to the user.
      • When the user pans or zooms to a product not located in local cache, streaming should switch to remote cache where product is available. Or should this generate a request to transfer the product to the local cache?
  • Phase B Work
    • Data Centres
    • Algorithms
    • Visualization
    • Deploy AstroGrid DSA and CEA modules for a UK disc cache
    • Code request mechanism for obtaining export data from US data centre
    • Test network latency between US and UK
    • Liaise with developers at Stanford regarding test implementation of AstroGrid modules
    • Write and test 11 solar algorithms
    • Deploy AstroGrid CEA modules for both UK and US hosting machines
    • Liasie with Stanford University to experiment with using the AstroGrid workflow system in the JSOC pipeline
    • Liaise with Stanford University to prototype streaming tool
    • Set up catalogues with AstroGrid DSA module
    • Develop GUIs and code for gallery and movie generation
  • Thanks Thanks for your attention. Any questions? eSDO Project Team: MSSL Elizabeth Auden Len Culhane Mike Smith Lidia van-Driel Gesztelyi RAL Andrzej Fludra Richard Harrison Vito Graffagnino University of Sheffield Michael Thompson Sergei Zharkov University of Birmingham Bill Chaplin Yvonne Elsworth Thierry Toutain