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7 July 1993 Oxygen imager (OXI) for magnetospheric imagery applications
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The study of upflow of ions from the high latitude ionosphere into the magnetosphere and the consequences of this outflow is the primary objective of a proposed small explorer mission. We describe an extreme ultraviolet instrument for imaging upflowing O+ ions which is part of this mission. The instrument is designed to measure solar 834 angstroms emissions resonantly scattered by upflowing O+ ions. Preliminary calculations of the maximum intensity expected from this process yield a value of approximately 0.1 Rayleigh. The technical challenge of measuring this signal in the presence of the bright background due to lower thermospheric airglow and aurora (approximately 1000 Rayleigh) was addressed by the choice of a favorable observational geometry. In addition, the presence of airglow signals in the nearby spectral region must be discriminated against to obtain a high signal-to-noise O+ image. Our instrument uses a normal incidence spherical mirror in prime focus configuration with a curved focal plane detector. The mirror will be coated with a multi-layer coating; further spectral discrimination will be obtained through the use of thin-film metal filter and an appropriate detector photocathode.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Supriya Chakrabarti, Daniel M. Cotton, Timothy A. Cook, and G. Randall Gladstone "Oxygen imager (OXI) for magnetospheric imagery applications", Proc. SPIE 2008, Instrumentation for Magnetospheric Imagery II, (7 July 1993);

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