Processing the Yohkoh Movies
The original data
The original data, in the form of raw (and later, processed) Yohkoh
SXT CCD images, are transferred via anonymous ftp from the Institute
of Space and Astronautical Science in Japan to the Lockheed Martin
Solar and Astrophysics Laboratory (LMSAL) in the U.S.
Here, they are read using
part of an extensive package of Yohkoh processing and analysis
software written in the proprietary language IDL from Research Systems in
A series of still images
Using IDL, each 256 x 256-pixel CCD frame is scaled and transformed to
a color GIF image. (The raw data also has to have background subtracted,
including the removal of "hot" CCD pixels - see the
YPOP movie maker page for more info).
Home at last
The resulting binary files are used to generate an MPEG movie (one for each orbit)
and placed online for your perusal.
Return to eclipse images page