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- This Quicktime movie was created from soft X-ray images of the Sun
- obtained with the earth-orbiting Yohkoh ("Sunbeam") satellite of the
- Institute of Space and Astronautical Science (ISAS), Japan. The Soft
- X-ray Telescope (SXT) was prepared by the Lockheed Palo Alto Research
- Laboratory, the National Astronomical Observatory of Japan, and the
- University of Tokyo with the support of NASA and ISAS. The Project Manager
- for Yohkoh is Prof. Yoshiaki Ogawara at ISAS, and the Project Scientist is
- Prof. Yutaka Uchida at the Department of Astronomy, University of Tokyo.
-
- The movie consists of one image per day, with initial frame formats
- of 256 x 256 or 512 x 512 pixels, taken through an aluminum/magnesium
- composite filter with a mean wavelength of about 20 Angstrom for normal
- temperatures of the Sun's tenuous corona, i.e., in excess of 1 million
- degrees Kelvin. Each image is a composite of one shorter and one
- longer exposure, to extend the dynamic range of the charge-coupled device
- (CCD) detector. Background has been removed and all images are normalized
- to an exposure time of one second. The range of times covered is 1993
- January 1 to 1993 May 31.
-
- The image data, kindly provided by Dr. Maki Akioka of the Hiraiso
- Solar Terrestrial Data Center, Communications Research Laboratory Data
- Service, were originally in Flexible Image Transport System (FITS) format.
- They were converted to PICT format using the Interactive Data Language (IDL)
- from Research Systems, Inc., and thence into a Quicktime movie using the
- shareware utility MovieMaker 1.2 by Jesse Jones. The movie is run at 10
- frames per second, so that the entire 151 frames take just over 15 seconds
- to view, a factor of nearly 870,000.
-
- For more information on accessing daily Yohkoh SXT images, contact
- Dr. Akioka at akioka@planet.hi.crl.go.jp. Scientists interested in using
- Yohkoh data in their research, and educators who would like to use Yohkoh
- data in the classroom, should contact the Yohkoh science team at
- yohkoh_team@isass0.solar.isas.ac.jp, or the Solar Data Analysis Center at
- NASA Goddard Space Flight Center, at gurman@sdac.gsfc.nasa.gov.
-
- 1993 October 13 Joseph B. Gurman
- Facility Scientist, SDAC
- gurman@sdac.gsfc.nasa.gov
-