Certifying Stray-Light Rejection and Photometric Performance for "SMEI"

Physics – Optics

Scientific paper

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2194 Instruments And Techniques

Scientific paper

The Solar Mass Ejection Imager (SMEI) is a collaborative project between the Air Force, UCSD/CASS, and the University of Birmingham, England. It will fly on the CORIOLIS spacecraft, scheduled for launch in September 2002. The platform provides a zenith-pointing, terminator orbit. SMEI's three CCD cameras, each viewing a 3 x 60 degree swath of sky, will provide a visible-light map of nearly the entire sky each 100-minute orbit. The instrument is designed to deliver 0.1% differential photometry, and 10-15 orders of magnitude scattered-light reduction when viewing further than 20 degrees from the Sun. We present the results of laboratory measurements which certify that these specifications are met by the SMEI flight hardware. We will also present night-sky data taken with the SMEI prototype optics, and progress on normalizing, flat-field correcting, and registering the SMEI data into a standard sky coordinate frame. This work is supported by AFRL contract F19628-00-C-0029.

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