Yohkoh galileo to infinity and beyond
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Yohkoh Galileo: To Infinity! … and Beyond!. Lockheed Martin’s Role in the Yohkoh Galileo Project 10 July 2002. Introduction. Purpose of the Yohkoh Galileo Project:

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Yohkoh Galileo: To Infinity! … and Beyond!

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Yohkoh Galileo: To Infinity! … and Beyond!

  • Lockheed Martin’s Role

  • in the Yohkoh Galileo Project

  • 10 July 2002


  • Purpose of the Yohkoh Galileo Project:

    “The Yohkoh Galileo project will complete higher-level data preparations and will archive the required calibration and technical information necessary for the extended use of the archive by scientists now and in the future.”

Lockheed Martin Tasks

  • Production of Level 0 data products

    • Retains original Yohkoh (Mons Morrison) format

    • Final delivery to SDAC (GSFC)

  • Publication of Level 1 data products

  • Publication of Level 2 data products

  • Publication of additional (Level 2+) products

  • Production of final calibration data products

Definition of Data Products

  • Level 0 Data (original format)

  • Level 1 Data:

    • FITS format - Maintain compatibility with latest FITS header definitions

    • FFI set - Uncompressed, despiked, dark subtracted, leak subtracted (but not spatially coaligned)

    • PFI (OR) set - Uncompressed, despiked, dark subtracted, leak subtracted and assembled

Definition of Data Products (continued)

  • Level 2 Data (SXT):

    • Desaturated (composited)

    • SSC (SXT Science Composite set): Uncompressed

    • SSS (Full disk movie version)

      • Replaces SFDs

      • Logarithmic compression and intensity normalized

      • Coaligned

Definition of Data Products (continued)

  • Level 2+ Data (SXT):

    • Descattering of SSC and SSS sets

    • Synoptic maps, coronal hole maps, active region catalog, flare catalog

    • Mission light curve data

Notes on FITS Definition

  • Final generation of FITS format

  • Format to be compatible with all standard fits headers available at that time (e.g., include observer position information)

    • Header content under review

    • Separate revision control for format and content

    • Files will contain only one solar image per file

Notes on FITS Content

  • Content definition of the SXT FITS header:

    • Will be led by Freeland with input from others.

    • Expect first draft of header to be released August 1.

    • Comments will be solicited. We strongly urge the other instrument teams to adopt a similar standard.

    • Expect the final version of the header to be released October 1.

Notes on FITS Definition

  • Open issues concerning FITS definition:

    • Make use of binary extensions features or avoid?

    • How to include history information? (Probably standardize a format using the comment field)

    • How to handle uncertainties

      • Separate archives or files (provides format longevity)?


      • Two images per file (minimizes overhead)?

Notes on FITS Definition

  • Data format and content should be compatible with VSO/EGSO standards

  • SXT calibration data and certain generic data (e.g., ATT, FEM, etc) will be archived in FITS format

Status of Level 0 Tasks

  • Delivery of reformatted raw data (Level 0) to the SDAC:

    • On schedule for completion by July 31, 2002.

Status of Level 1 Tasks:

  • Leak subtraction software:

    • This is the major open calibration task.

    • Current algorithm (Metcalf/Acton) uses a two step correction procedure:

      • Subtraction of interpolated leak images

      • Removal of any residual component that remains correlated with the interpolated leak image.

Status of Level 1 Tasks:

  • Leak subtraction algorithms (continued):

    • Leak subtraction is handled separately for each ‘epoch’ of the mission (each epoch is defined to be the period between two successive SXT entrance filter failures)

    • Within each epoch there must be a sufficient set of valid terminator (leak) images for leak image interpolation

    • Currently, there are two short (~2 month) epoches in 1999 for which leak image sampling was insufficient to allow leak image interpolation. The leak image algorithms for these periods have yet to be developed.

Status of Level 2 Tasks:

  • Software is ready

  • Major outstanding task is ATT finalization

Status of Level 2+ Tasks:

  • Descatter - MSU

  • Synoptic map - Slater

    • 75% complete; expect 100% by 1 Oct 2002

  • Catalogs - In progress

Status of Calibration Tasks:

  • Final calibration tasks:

    • Dark Subtraction algorithms: Completed.

    • Composite image generation techniques: Completed (three exposure composites now incorporated).

  • SSC/SSS generation pipeline:

    • In place and in use.

    • Currently implementing distributed processing (GLOBUS) on ISAS and LMSAL computers.

SXT data production pipeline

  • Data products beyond level 0 are in some cases interdependent. However, some of the calibration products (ATT, leak subtraction) are currently open-ended. Therefore, it is important to have data ‘pipelines’ set up for regenerating various data products multiple times over the course of the Galileo project

SXT data production pipeline

  • We propose to establish a ‘cycling’ queue for each data product (e.g., SSC set) which will run automatically as updates to software or calibration sets become available

  • In this way we can be assured that when the project nears completion we will not be caught without adequate to complete all data products

SXT data production pipeline

  • As part of the pipeline, we are devloping a GLOBUS system on the ISAS/LMSAL/MSU? Computers, to decrease the turn around times for data product versions

Additional Lockheed tasks

  • Update SXT emissivity software to incorporate new abundance and ionization data (with application to SXT temperature and emission measure calculations: sxt_teem)

  • GOES-12 SXI /SXT cross calibration

  • Yohkoh scientific campaign catalog

  • Improvement of user interface to SXT data (including full mission ‘events’ access)

Additional Lockheed tasks

  • Improvement of ATT (spacecraft pointing) database

  • SXT uncertainties

    • Generate for FFI

    • Seek to preserve photon statistics through the calibration process

  • Radiation Belt Monitor (RBM) Level-1 generation

  • Combined SXT/HXT/BCS flare catalog


  • Level 0complete by 31-Jul-02

  • Level 1ongoing

  • Level 2ongoing

  • Level 2+ongoing

LMSAL team:

  • Primary

    • S. Freeland, T. Metcalf, N. Nitta, G. Slater

  • Supporting

    • D. Alexander, M. Aschwanden, F. Friedlaender, J. Lemen, P. Shirts

  • Transitional

    • J. Bartus, H. Hudson, A. Takeda

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