834-A reflective coating for magnetospheric imagery applications

Supriya Chakrabarti; Jerry Edelstein; Ritva A. M. Keski-Kuha; Felix T. Threat

doi:10.1117/12.60594

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1 June 1992 834-A reflective coating for magnetospheric imagery applications

Supriya Chakrabarti, Jerry Edelstein, Ritva A. M. Keski-Kuha, Felix T. Threat

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Proceedings Volume 1744, Instrumentation for Magnetospheric Imagery; (1992) https://doi.org/10.1117/12.60594
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

Imaging upflowing O⁺ ions of ionospheric origin and plasmaspheric O⁺ 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.

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Supriya Chakrabarti, Jerry Edelstein, Ritva A. M. Keski-Kuha, and Felix T. Threat "834-A reflective coating for magnetospheric imagery applications", Proc. SPIE 1744, Instrumentation for Magnetospheric Imagery, (1 June 1992); https://doi.org/10.1117/12.60594

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