The Yohkoh Galileo Project --- International Coordination Meeting Nobeyama, Japan July 2002

Back when some of us were a little less gray. - courtesy Minoru Oda

Party, Jan. 1987

EOF, Nov. 1991

Group, Nov. 1991

Two Interesting Vu-graphs - courtesy of Jack Harvey

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.

NASA Response to Yohkoh Galileo 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.

Permanent Yohkoh Archive Leading 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.)

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.

Final Documentation 1.Existing documents, e.g., 1.Pre-launch papers in Solar Physics 2.Yohkoh Analysis Guide 3. SXT Experiment Interface Agreement 2.Yohkoh Archive User’s Guide Deals primarily with use of Level 1 & 2 data 3.HTML-based tools for access and analysis 4.The Yohkoh Legacy book

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.

Book Outline

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

Schedule