Language: &ngiisn Journal Announcement: EDB8611 Availability: NTIS, PC A02/MF AOQ1. Subfile: BRA (Energy Research Abstracts). GRA (NTIS NTS) Country of Origin: United States Country of Publication: United States Abstract: The objective of this project was to photograph the spectrum of the bomb light of the three high-altitude nuclear detonations of Operation Hardtack from two high-flying aircraft with a time resolution of 50 seconds and a spectral resolution adequate to identify the emission or absorption spectrum of molecular species that might be formed around the fireball. Major Descriptors: *HARDTACK PROJECT; *NUCLEAR EXPLOSIONS -- NUCLEAR FIREBALLS; *NUCLEAR FIREBALLS -- ABSORPTION SPECTRA; *NUCLEAR FIREBALLS -- EMISSION SPECTRA Descriptors: AIRCRAFT; ATMOSPHERIC EXPLOSIONS; BOMBS; MOLECULES; PHOTOGRAPHY; RESOLUTION Broader Terms: EXPLOSIONS; FIREBALLS; NUCLEAR EXPLOSIONS; SPECTRA; WEAPONS Subject Categories: Weaponry 10/5/510 01877594 Author(s): Baker, -* 450202* (Item 210 from file: 103) BRA-12-005121; EDB-87-005227 Brubaker, D.J. R.M.; Gauvin, Title: Operation Hardtack. high-altitude bursts Corporate Source: Publication Date: Report Number(s): Document -- Explosions & Explosives -~ Nuclear -- (-1989). Type: H.P.; Project 8.2. Air Force Geophysics 1 Sep 1985 p 68 A.T.; Cahill, J.P.; Thermal radiation from Lab., Hanscom AFB, MA (USA) AD-A-995390/2/XAB Report Language: English Journal Announcement: EDB8611 Availability: NTIS, PC A04/MF AO0Ql. Subfile: Stair, BRA (Energy Research Abstracts). Country of Origin: United States Country of Publication: United States GRA (NTIS NTS) Abstract: The objective of this project was to improve the basic understanding of the physics of high-altitude nuclear detonations by measuring the thermal radiation from the high-altitude Shots Yucca, Orange, and Teak. Spectral irradiances obtained by distant airborne instrumentation are presented as a function of time in four wavelength bands. The measurements are extrapolated to an assumed point source, and these generalized results are discussed. Simple scaling laws are not sufficient to predict the thermal radiation from a high-altitude nuclear detonation. In particular, the power radiated in the infrared exceeds by a large factor that expected from a black body of dimensions comparable with the visible fireball. This implies the existence of some mechanism that is producing a greater proportion of infrared radiation than would be obtained using the equilibrium blackbody theory. Major Descriptors: *BLACKBODY RADIATION; *HARDTACK PROJECT; *INFRARED RADIATION; *NUCLEAR EXPLOSIONS -- THERMAL RADIATION; *THERMAL RADIATION -- SPECTRA | Descriptors: ATMOSPHERIC EXPLOSIONS; NUCLEAR FIREBALLS; PHYSICS; TIME DEPENDENCE Broader Terms: ELECTROMAGNETIC RADIATION; EXPLOSIONS; FIREBALLS; NUCLEAR EXPLOSIONS; RADIATIONS Subject Categories: Weaponry -- 10/5/5i1 01877593 Author(s): 450202* (-1989) -- Explosions & Explosives -- Nuclear -- {Item 211 from file: 103) BRA-12-005120; Derksen, W.L.; Koehety a1 q 2 EDB-87-005226 Carter, J.A.; Hirschman, A.; de Lhery, G.P.;