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HMI Telecon Minutes 01 July 2005


  1. eSDO helioseismology algorithms for the HMI pipeline:
    • mode frequency analysis
    • mode asymmetry analysis
    • subsurface flow analysis
    • perturbation map generation
    • local helioseismology inversion workbench
  2. HMI data products and the US / UK data centres
    • Input / output products for above algorithms
    • Touch on useful products to temporarily / permanently store in UK data centre
  3. Upcoming meetings
    • Elizabeth's visit in September
    • Joint AIA / HMI meeting in February


eSDO Algorithms

The JSOC pipeline will work in two ways: 1) an automated system of modules will produce the AIA / HMI data products specified in contracts with NASA, and 2) additional analysis algorithms will be accessible through shell scripts run on JSOC systems - such tools may include alternative or user-input driven algorithms. The eSDO helioseismology algorithms will likely go in the second category. The automated pipeline will include global helioseismology algorithms from MDI will little change; Phil will liase with Mike Thompson in July about parallel development of local helioseismology algorithms.

HMI Data Products / UK Data Centre

AIA and HMI data can be approached differently in terms of UK data centre storage. AIA users will be interested in recent data, and the temporary disc cache can sensibly keep a rolling store of low and high level data. Suggested AIA products to store in the UK are level 1a and automatically generated level 2 products:

  • Reduced resolution 1k x 1k full disk images
  • Full resolution images from tracked active regions
  • Auto-generated higher level data such as thermal maps, DEM measures, irradiance curves, etc

On the other hand, HMI users will want data from much longer timespans. Suggested HMI products to archive permanently (rather than cache):

  • Magnetograms
  • Dopplergrams
  • Intensitygrams (20 minute average)

Movies or sampled images for the permanent tape store over the mission lifetime could include AIA low resolution or tracked active region images and HMI magnetograms and dopplergrams. The UK data store could reasonably strive to hold the above products; requesting level 1 data (rather than 1a) may stretch transAtlantic bandwidth, and too many possible combintations exist to attempt request of on-the-fly products. In September, details will be discussed of UK user access to on-the-fly products.

Upcoming Meetings / Additional Discussion

Technical details can be discussed in Stanford during Elizabeth's visit in September. HMI scientists and developers will attend the joint AIA / HMI meeting in February 2006; placement of UK algorithms in the add-on / shell script portion of the JSOC computing system can be discussed at that time.

Phil also brought up the idea of a portable data mirror. Elizabeth and Len will look at internal JSOC concept documents for the DRMS and discuss next week.

-- ElizabethAuden - 01 Jul 2005

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Topic revision: r1 - 2005-07-01 - ElizabethAuden
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