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Twilight intensity variation of the infrared hydroxyl airglow
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gilbert, K. L. Lowe, R. P. Niciejewski, R. J. |
| Copyright Year | 1984 |
| Description | The 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. |
| File Size | 102752 |
| Page Count | 3 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850012171 |
| Archival Resource Key | ark:/13960/t6d26rv6b |
| Language | English |
| Publisher Date | 1984-05-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Luminous Intensity Hydroxyl Emission Accuracy Spectrometers Spectral Bands Variations Twilight Glow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
