Accession Number : ADA119946

Title :   Further Evaluations of Infrared Simulation Data.

Descriptive Note : Technical rept.,


Personal Author(s) : Kofsky,Irving L ; Trowbridge,Christian A ; Villanucci,Dennis P ; Chamberlain,Malcolm T

PDF Url : ADA119946

Report Date : 30 Nov 1981

Pagination or Media Count : 128

Abstract : Infrared-optical atmospheric nuclear backgrounds simulation data from DNA/AFGL rockets EXCEDE: Spectral and PRECEDE (excitation of air by 3 keV electron beams) and NKC-135A aircraft (aurora and airglow radiations) are evaluated and interpreted. The output of 2.8 -3.1 micron radiation from the auroral ionosphere, measured with a radiometer having footprint 1 km square, is correlated with particle energy input to within less than or approx. 3 sec, and the yield varies between 0.6% and 1.3%. No statistically significant correlation was found between this SWIR emission efficiency or delay and a series of auroral (and measurement) parameters, which included the fractional solar illumination of the radiating air volumes. The distributions of visible radiance from EXCEDE are found to differ from predictions of accepted models of electron transport and atmospheric excitation, both individiual photographic frames and as a function of charge-ejection altitude; principally, there is an excess of radiation from within a few rocket diameters, and the mean brightness changes much more slowly than the ambient air density 6300 angstrom units glow that resulted when ionosphere-recombining molecules were exhausted by HEAO-C's launch rocket (Eastern Test Range, 20 Sep 79) were derived from calibrated video images; its lateral growth rates indicate that the widespread F-region after-glow results principally from reactions of H log.

Descriptors :   *Infrared radiation, *Upper atmosphere, Aurorae, Electron accelerators, Photometry, Radiance, Radiometry

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE