Measurement of atmospheric ultraviolet radiation from a low-Earth orbit satellite

Sam Clegg; Richard W. Eastes; Michael E. Gangl; John H. Middlestadt

doi:10.1117/12.186613

14 September 1994 Measurement of atmospheric ultraviolet radiation from a low-Earth orbit satellite

Sam Clegg, Richard W. Eastes, Michael E. Gangl, John H. Middlestadt

Proceedings Volume 2282, Ultraviolet Technology V; (1994) https://doi.org/10.1117/12.186613
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

The design and expected measurements of the atmospheric ultraviolet radiance analyzer (AURA), a satellite experiment, are presented. The goal of AURA is to provide global measurements of the ultraviolet emissions (1150 angstrom to 1900 angstrom) from the Earth's atmosphere. These measurements will include spectra and images. AURA is expected to fly in a near circular, high inclination angle orbit. AURA is designed to have sufficient sensitivity to observe relatively weak emissions in the nighttime tropical arcs or the diffuse aurora. It will also provide excellent signal-to-noise measurements of the day airglow and discrete auroral arcs. The measurements will provide information on atmospheric background emissions and can be used to test remote sensing techniques for ionospheric parameters such as electron density profiles. The AURA instrument provides two channels of UV observations. Each channel uses a 1/8 meter Ebert-Fastie spectrometer mated to a telescope with a scanning mirror. The scan mirrors and grating angles are precisely controlled by stepper motors and use optical fiducials to determine absolute positioning. The two channels operate independently in mode (imaging, spectral, or photometer), viewing direction, and observed wavelength. The field-of-regard of these channels is a 180 degree(s) swatch, centered on nadir, perpendicular to the orbital path (spacecraft velocity vector). The angular field-of-view of these channels will be approximately 2.0 degree(s) by 0.2 degree(s). From the orbital altitudes anticipated (approximately 700 to 1000 km), this will provide higher spatial resolution than previous auroral images from spacecraft.

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Sam Clegg, Richard W. Eastes, Michael E. Gangl, and John H. Middlestadt "Measurement of atmospheric ultraviolet radiation from a low-Earth orbit satellite", Proc. SPIE 2282, Ultraviolet Technology V, (14 September 1994); https://doi.org/10.1117/12.186613

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KEYWORDS

Mirrors

Ultraviolet radiation

Spectroscopy

Satellites

Space operations

Atmospheric particles

Calibration

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