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Evans Spectroheliograms in SP FTP Site (1Sep94)
(from NSO, NOAO Newsletter No. 39, 1 September 1994)

The daily CaK and H-alpha spectroheliograms made at the Evans Solar Facility
are available at ftp.sunspot.noao.edu in the directory /pub/shg in gif
images. SELSIS images for the current week are also available in
/pub/shg/sel. The pictures are made by frame grabbing a video image of the
negative on a light table. The gif images are scaled to fill the 8 bit range,
the y direction is compressed to make the Sun circular, and the CaK data has
a gamma = 2 applied. Prints from the original negatives are available upon
request.

Fritz Stauffer, Matt Penn

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