Sage 44 sets witn 102 of OFFICIAL USE ONLY Order number 940406-171827-13 150. 110. wart Item 78 REPORT NUMBER PRIMARY TITLE (M) LAC~LMSD-~-288070 report Absorption coefficients of air. Final summary ‘ Landshoff, R.K.M.; Buttrey, D.E. 70. PERSONAL AUTHOR (M) Lockheed Aircraft Corp., Sunnyvale, CA (USA) 710. CORPORATE SOURCE 591000 371. PUB. DATE (YYMMDD) Unclassified 34. CLASSIF. LEVEL TEXT Research is summarized on the study of the 950. ABSTRACT absorption coefficients of hot gases for the analysis of nuclear fire balls and other high temperature sources. The research carried out included a theoretical calculation of the absorption coefficients of air for temperatures from 1000 to 12,000{sup 0}K and for densities from 10 to 10{sup -6} times normal sea level air density. An interpretation of data taken at Operation Redwing was made concerning light absorption shells in air after passage of shocks from nuclear explosions. Experimental studies were made by the observation of spectra under shock tube conditions to ascertain optical properties 801. KEYWORD (S) of O{sub 2} and N{sub 2} at high temperatures. Additional absolute intensity measurements must be made in order to compare theoretical and experimental results quantitatively. Qualitatively, experimental and theoretical results are in agreement. 4 references. AIR/absorption spectra ; THERMAL RADIATION/absorption ; ATMOSPHERIC BURSTS/thermal radiation ; ATMOSPHERIC BURSTS/visible radiation ; VISIBLE RADIATION/absorption ;REDWING; ATOMIC WEAPON TESTS;BALL OF FIRE;AIR;NITROGEN OXIDES; ABSORPTION Item 79 150. REPORT NUMBER 110. PRIMARY TITLE (M) 70. PERSONAL AUTHOR (M) 371. PUB. DATE (YYMMDD) 34. CLASSIF. LEVEL TEXT 950. ABSTRACT (ONR) NMDL-TP--28 Seismic studies of Eniwetok Atoll. McLeroy, E.G.; Dowling, G.B. Part I 580600 Unclassified As a part of the 1957 Office of Naval Research survey of Eniwetok Atoll, seismic measurements were made to determine the bottom reflectich coefficients on the outside southwest slope of the atoll. The values of the reflection coefficients are low and irregular and have been related to bottom structure. Reflections from several very thin shallow layers and from deeper layers were observed indicating a submarine geology agreeing with that found previously by other 5003418 OFFICIAL USE ONLY