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The Extreme Solar Ultraviolet Monitor (ESUM) experiment made
absolute broadband spectro-radiometric measurements of the solar
EUV flux from 200 A to Lyman-alpha at 1216 A and made precise
measurements of the temporal variability. The instrument
consisted of two identical windowless EUV photodiodes with
aluminum oxide cathodes and a filter wheel containing two sets
of unbacked metallic filters (aluminum, tin, indium) and an open
position. A visible light diode measured the pinhole
transmittance of the filters to determine the white light
background. The tilt angle of the instrument relative to the +Z
spacecraft axis was optimized for the maximum viewing time of
the sun in both spinning and despun spacecraft modes. The
instrument field of view was 60 deg. The nominal bandwidths in
Angstroms for 50% of the signal were 270 to 550, 570 to 584, 800
to 935, and 1216 A.
[Summary provided by NASA]
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