Computer Science
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..22w&link_type=abstract
"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T
Computer Science
Scientific paper
In late 2010, a star cluster will be observed with narrowband red filters to determine the impact of fringing (position- and wavelength-dependent patterns of brightness variation) on flight data. Ground flat fields show peak-to-trough amplitude variations of 0.5% to 16% (among 12 affected filters). Different "fringe flat fields" created by models will be applied to the flight data to compare corrections. Two separate sets of ground test data provide different thickness maps (and thus create different fringe flats). The disagreement between the thickness maps is consistent with an error in the monochromatic illumination wavelengths in one of the ground test data sets, but an unexplained corner-to-corner slope across the detector remains even after correcting for the wavelength error. Flight data are needed to determine which thickness map produces the best correction for fringing, and improvements to fringe data analysis may be needed to achieve the best correction.
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