NSSDCA ID: SOXR-00035
Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)
This data set consists of demonstration programs and image data files on an IBM-compatible 1.2 MByte diskette which display some sample images from the Skylab X-ray Spectrographic Telescope (S-054) on an IBM-compatible PC with a monitor that supports standard color VGA graphics. The data set is entitled "NATIONAL SPACE SCIENCE DATA CENTER -- SKYLAB IMAGE DISPLAY DEMO, Version 1.4" with release date September 23, 1992. The programs are in both executable and C source code listing. The image data files are documented in READ.ME files on the diskette, and may be read by the display programs on the diskette, or loaded into other image display applications on PCs or on other computers equipped to read the DOS binary data files. The images are full-disk solar images in the 2 - 60 Angstrom wavelength band, reduced into 230 x 198 pixel 8-bit-per-pixel format for use with 256-color graphics displays on IBM PC compatibles. Four of these sample images are included with this Demo diskette. Additional images and software for porting the image data from its native form to IBM PCs may be obtained from the author. The demo consists of a series of image displays using the programs, driven by a BAT file. First the user is shown a sample image using three different false-color renditions of the solar X-ray image brightness. Second, using one of the false-color intensity renditions, the user is shown two different solar images, recorded about three days apart in time, alternately on the screen so that the changes due to solar rotation and coronal evolution may be seen. Third, image enhancement to improve feature definition is briefly described, and the user is shown an unprocessed image and the enhanced version of it, alternately. Fourth, two images, separated by a full solar rotation in 28 days, and enhanced to show greater detail, are shown alternately. Fifth, the user is allowed to explore an image in detail -- an image several times the size of the visible portion of it on the screen -- by "panning" the screen window across the image, using the PC's "arrow" keys. For users equipped with Super VGA 1024 x 768 video graphics adapter cards, there is also a program that they may use to view a high- resolution version of one of the sample images.
Questions and comments about this data collection can be directed to: Dr. David A. Batchelor
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