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Radiometric calibration of the telescope and ultraviolet spectrometer SUMER on SOHO

Wilhelm, Klaus; Schühle, Udo; Curdt, Werner +4 more

The prelaunch spectral-sensitivity calibration of the solar spectrometer SUMER (Solar Ultraviolet Measurements of Emitted Radiation) is described. SUMER is part of the payload of the Solar and Heliospheric Observatory (SOHO), which begins its scientific mission in 1996. The instrument consists of a telescope and a spectrometer capable of taking sp…

Performance of ion-figured silicon carbide SUMER telescope mirror in the vacuum ultraviolet

Saha, Timo T.; Leviton, Douglas B.; Glenn, Paul

Measured and theoretical encircled energy and small-angle scatter of the telescope mirror (SST) of the solar ultraviolet measurements of emitted radiation (SUMER) instrument are compared at the wavelength of 123.6 nm. Mirror performance modeling was accomplished with the Optical Surface Analysis Code software package. The modeling is based on meas…