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Twilight Intensity Variation of the Infrared Hydroxyl AirglowThe vibration rotation bands of the hydroxyl radical are the strongest features in the night airglow and are exceeded in intensity in the dayglow only by the infrared atmospheric bands of oxygen. The variation of intensity during evening twilight is discussed. Using a ground-based Fourier Transform Spectrometer (FTS), hydroxyl intensity measurements as early as 3 deg solar depression were made. Models of the twilight behavior show that this should be sufficient to provide measurement of the main portion of the twilight intensity change. The instrument was equipped with a liquid nitrogen-cooled germanium detector whose high sensitivity combined with the efficiency of the FTS technique permits spectra of the region 1.1 to 1.6 microns at high signal-to-noise to be obtained in two minutes. The use of a polarizer at the entrance aperture of the instrument reduces the intensity of scattered sunlight by a factor of at least ten for zenith observations.
Document ID
19850012171
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lowe, R. P. (University of Western Ontario London Ontario, Canada)
Gilbert, K. L. (University of Western Ontario London Ontario, Canada)
Niciejewski, R. J. (University of Western Ontario London Ontario, Canada)
Date Acquired
August 12, 2013
Publication Date
May 1, 1984
Publication Information
Publication: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 10
Subject Category
Geophysics
Accession Number
85N20481
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19850012140Collected WorksMiddle Atmosphere Program. Handbook for MAP, Volume 10
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