Physics – Optics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2801l&link_type=abstract
American Astronomical Society Meeting 210, #28.01; Bulletin of the American Astronomical Society, Vol. 39, p.135
Physics
Optics
1
Scientific paper
The SECCHI investigation on the STEREO mission contains two Extreme Ultraviolet Imagers (EUVI), one on the ahead spacecraft and one on the behind spacecraft. EUVI views the solar disk using multilayer-coated normal-incidence optics that image onto 1.6 arcsec-per-pixel back-thinned CCD detectors. Four wavelength bandpasses are observed in series, 17.1 nm (Fe IX), 19.5 nm (Fe XII), 28.4 nm (Fe XV), and 30.4 nm (He II), covering the chromospheric and coronal plasma temperatures.Science operations began in January 2007 and both EUVIs are working very well. The fine pointing system effectively removes low frequency spacecraft pointing jitter, so the image resolution quality is very good, approaching 3.5 arcsec. We present early on-orbit assessments of the performance of both EUVIs and updated predictions for the temperature dependent instrument response functions, which are compared to early observations. The lunar transit observed by the EUVI on the behind spacecraft is used to assess the point spread function.
This work is supported by the NASA STEREO mission under NRL contract N00173-02-C-2035.
Aschwanden Markus
Lemen James
Nitta Nariaki
Wuelser Jean-Pierre
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