Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1744..208c&link_type=abstract
Proc. SPIE Vol. 1744, p. 208-215, Instrumentation for Magnetospheric Imagery, Supriya Chakrabarti; Ed.
Physics
Scientific paper
Imaging upflowing O(superscript +) ions of ionospheric origin and plasmaspheric O(superscript +) can be achieved through solar resonance scattering at 834 angstroms. Unfortunately, several strong background emissions, including the ones at 1025 angstroms and 1216 angstroms due to geocoronal hydrogen atoms, pose serious problems to its implementation. Most common optical coatings have higher reflectivity at 1025 angstroms and 1216 angstroms than at 834 angstroms. We have designed a multiple-layer coating which selectively reflects 834 angstroms radiation and suppresses 1025 angstroms and 1216 angstroms radiation. The structure of the coating material consists of a very thin (50 - 150 angstroms) method (nickel) layer, on top of a semitransparent dielectric material (magnesium fluoride), over an aluminum substrate. Three such coatings were produced at NASA Goddard Space Flight Center using an existing coating facility which is not optimized for thin coatings. In spite of such fabrication difficulties, we have obtained encouraging results.
Chakrabarti Supriya
Edelstein Jerry
Keski-Kuha Ritva A.
Threat Felix T.
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