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Proceedings Paper

SWIR air glow mapping of the night sky
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Paper Abstract

It is well known that luminance from photo-chemical reactions of hydroxyl ions in the upper atmosphere (~85 km altitude) produces a significant amount of night time radiation in the short wave infra-red (SWIR) band of wave length 0.9 to 1.7 μm. Numerous studies of these phenomena have demonstrated that the irradiance shows significant temporal and spatial variations in the night sky. Changes in weather patterns, seasons, sun angle, moonlight, etc have the propensity to alter the SWIR air glow irradiance pattern. By performing multiple SWIR measurements a mosaic representation of the celestial hemisphere was constructed and used to investigate these variations over time and space. The experimental setup consisted of two sensors, an InGaAs SWIR detector and a visible astronomical camera, co-located and bore sighted on an AZ-EL gimbal. This gimbal was programmed to view most of the sky using forty five discrete azimuth and elevation locations. The dwell time at each location was 30 seconds with a total cycle time of less than 30 minutes. The visible astronomical camera collected image data simultaneous with the SWIR camera in order to distinguish SWIR patterns from clouds. Data was reduced through batch processing producing polar representations of the sky irradiance as a function of azimuth, elevation, and time. These spatiotemporal variations in the irradiance, both short and long term, can be used to validate and calibrate physical models of atmospheric chemistry and turbulence. In this paper we describe our experimental setup and present some results of our measurements made over several months in a rural marine environment on the Islands of Kauai and Maui Hawaii.

Paper Details

Date Published: 12 August 2010
PDF: 7 pages
Proc. SPIE 7816, Advanced Wavefront Control: Methods, Devices, and Applications VIII, 78160J (12 August 2010); doi: 10.1117/12.862544
Show Author Affiliations
Michael M. Myers, Air Force Research Lab. (United States)
David C. Dayton, Applied Technology Associates (United States)
John D. Gonglewski, Air Force Research Lab. (United States)
Gregory Fertig, Air Force Research Lab. (United States)
Jeff Allen, Applied Technology Associates (United States)
Rudolf Nolasco, Air Force Research Lab. (United States)
Dennis Burns, Textron Defense Systems Kauai (United States)
Ishan Mons, Textron Defense Systems Kauai (United States)

Published in SPIE Proceedings Vol. 7816:
Advanced Wavefront Control: Methods, Devices, and Applications VIII
David C. Dayton; Troy A. Rhoadarmer; Darryl J. Sanchez, Editor(s)

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