Abstract. Beginning on March 11, 1998, the Student Nitric Oxide Explorer (SNOE) satellite has made daily observations of the solar soft X-ray irradiance. These measurements are carried out by a multichannel photometer system. The spectral range between 2 and 20 nm is covered by three channels with bandpasses of 2-7 nm, 6 -19 nm, and 17 -20 nm respectively. Absolute sensitivities were measured prefiight using the Synchrotron Ultraviolet Radiation
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