The Yohkoh Galileo Project

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The Yohkoh Galileo Project

• ---
• International Coordination Meeting
• Nobeyama, Japan
• 10-11 July 2002

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Backwhensome of uswere a little less
gray.-courtesy Minoru Oda
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Party, Jan. 1987
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EOF, Nov. 1991
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Group, Nov. 1991
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TwoInterestingVu-graphs-courtesy of Jack
Harvey
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The Yohkoh Galileo Project
The Japan/US/UK Yohkoh mission has been
an unprecedented scientific success. It is the
goal of the Yohkoh Galileo Project to create an
archive of Yohkoh data, processed results, and
calibration and analysis information of
sufficient quality so as to make these results
useful for science and scientists in perpetuity.
Experts should no longer be required to guide
others in the use of the data.
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NASA Response to YohkohGalileo Project
In early 2002, after it was certain that Yohkoh
could not be recovered, the MSU and LMSAL teams
(with support and cooperation of the MSSL team)
wrote a so-called white paper entitled
Plan for Yohkoh/SXT Mission Completion L. Acton,
J. Lemen 15-Mar-02
On the basis of this proposal NASA has agreed to
permit use of already authorized Yohkoh/SXT funds
for this archival work -- to be completed by 30
September 2003.
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Permanent Yohkoh ArchiveLeading questions

• Form and content of observational data?
• Form and content of documentation?
• Additional/improved interface access software?
• Unfinished calibrations?
• Other data products (e.g., flare lists, soft
  x-ray spectral irradiance, etc.)

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Yohkoh Data Products

• Level 0
• Reformatted raw Yohkoh data.
• Level 1
• Instrumental or (BCS) photon units.
• All calibrations and corrections applied.
• FITS format with exhaustive header info.
• No additional data base required to use these
• data products.
• Level 2
• E.g., SXT composite images, movies, flare list.

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Final Documentation

• Existing documents, e.g.,
• Pre-launch papers in Solar Physics
• Yohkoh Analysis Guide
• 3. SXT Experiment Interface Agreement
• Yohkoh Archive Users Guide
• Deals primarily with use of Level 1 2 data
• HTML-based tools for access and analysis
• The Yohkoh Legacy book

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The Yohkoh Legacy Book
The objective of this book is to create a
permanent record of 1. A selection of Yohkoh
science. 2. Everything needed to understand and
analyze the data. The book should explain how
the digital signals are related to incoming
photons, what corrections have been applied, and
the experimental uncertainty of the result.
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Book Outline
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Example Partial List of SXT Tasks

• SXT response calibration data correction
• Yohkoh pointing correction and verification
• SXT CCD gain calibration
• Stray light correction
• Changes in SXT spectral sensitivity
• Correction for vignetting and scattered x-rays
• Data preparation and products
• Documentation
• Cross calibration with GOES 12 Soft X-ray Imager

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Schedule