25 November 1999 Flat field of UVCS detectors for early part of SOHO mission
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Abstract
The Ultraviolet Coronagraph Spectrometer (UVCS) on the Solar and Heliospheric Observatory (SOHO) comprises two telescopes and two spectrometer channels for spatially resolved ultraviolet spectral diagnostics of the solar corona. The principal lines for which the two channels are optimized are the H I 'Lyman-(alpha) ' line at 121.5 nm and the O VI (O5+) doublet at 103.2 and 103.7 nm. An 'in-flight' method, using observations of stars and scattered solar disk light, has been devised to determine the flat field function, i.e., the relative detection efficiency of the detector pixels. We present the details and results of this process. Local pixel-to-pixel efficiency variation is found to be, typically, about plus or minus 9% to plus or minus 17% (1 (sigma) ) for the H I Lyman-(alpha) channel and plus or minus 9% for the O VI channel.
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Mario L. Cosmo, Mario L. Cosmo, Peter L. Smith, Peter L. Smith, Nigel Atkins, Nigel Atkins, R. M. Suleiman, R. M. Suleiman, Larry D. Gardner, Larry D. Gardner, John L. Kohl, John L. Kohl, } "Flat field of UVCS detectors for early part of SOHO mission", Proc. SPIE 3764, Ultraviolet and X-Ray Detection, Spectroscopy, and Polarimetry III, (25 November 1999); doi: 10.1117/12.371094; https://doi.org/10.1117/12.371094
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