roximately 100 chamels are going to be used for thermal input data and Project o? is concerned with thermal input data. The basic purpose of this project is to provide more information concerning atomic explosions to permit more accurate predictions of thermal flux at a point in space. More or less specific areas in which we are interested concern the fireball, its size, rate of rise, color tempera~ ture, blackbody quality and emissivity; the spectral distribution as a function of times; all of these as a function of time, yield and burst geanetry. Another aspect which we are interested in is the contribution of reflected radiation fron the earth 's surface and clouds which may be present. We're interested inthe effect on these reflecting surfaces of such things as shadowing of the earth's surface and ®- scuration by the fireball, We're interested in the phenamenon of reflection and of atmospheric scattering as a function of wave length amd as a function of field of view. We're still interested in the degree to which thermal radiation is nonisotropic. Another prodlea which we have to look into is an evaluation of the requirement of the thermal curtain. Instrumentation fram which I hope this information willbe ctained consists of roximately 100 channels and will be borne on WADC aircraft - the basber type - Beu7, 52, 57 and 66. The instrumentation is practically the same for all aircraft and would consist primarily of two stations, There would be 18 thermal transducers located in the tail station. and 16 NRDL calorimeters. These transducers would consist of two NRDL radiometers These instruments could be varied for varied fields of view and will be properly filtered to yield the maximum amount of spectral distribution information, The second station that will be borne by all aircraft is one located in the mid-fuselage. This will carry two thermal transducers which, as I recall, include a radiometer and two calorimeters. have a 180° field of view, These instruments ideally will Inthe tail station, we also will have six GSAP cameras oriented to GZ. These will be, in general, properly filtered ani with proper choice of film to produce more than documentary type filn, It is hoped that the information cbtained fran this will give us indications as to spectral distribution and, in the case of the two lighter aircraft, two of these cameras will be equipped with a dispersion device which will operate in the visible regions - which we hope will give us same indication of the variation of spectral distribution in time. In the mid-station with the transducers we will also have two GSAP cameras with a very large field of view = I'm not exactly sure what the field will be, but the focal length will be approximately 5.3mm. It is hoped that this will give us information with regard to the albedo history of envirorment at the time that the instruments were receiving the thermal energy. The two larger aircraft = the B-52 and the Bel\7 - will also carry some NRDL transducers in the cockpit to aid in the evaluation of this thermal curtain problem. The two lighter aircraft will probably carry passive indicators in the cockpit with the possibility of perhaps an independent self-recording thermal recarding device. We propose to participate on all shots where the aircraft fly. We intend to take four or five people to the FA with probably one located on Parry and probably four on Eniwetok. I'm very happy to say that we have no construction problems since we're more or less going along for the ride.