;rocsdures. Project 6.5 will also perform operational procedures on the Project 2.5b fall-out collectors aboard the Liberty ships, 5.5.3 Remarks eyThis project will operate in close coordination with 6.4. tion and installation’ of test panels mounting racks will be acq plished by BuShips. Use of snecial facilities on Parry Island will“be in conjunction with Project 6.4. This project will also par- ticipateiin€.4 ventilation system studies aboard the Liberty ships. 6.6 Bid Project Officer: 5.C.1 Title: Ionosphere Studies Ferforming Agency: Capt Andrew Giroux, USA =vans Signal Laboratory Cbhjective To further investigate an ionospheric phenomenon recorded during ty rt Procedure arnren 5.6.2 Y) and IVY, which had not previéysly been observed by ionospheric studies on GRESUHUUSE, BUSTER, and TUMBLER-SNAPPER. This phenomenon was the apparent increase in height: of.the F-2 layer and associated effects, sginning about the time the Sonic wave from the blast would have cached the ionosphere. It i8@esirable to establish a cause and effect relationship for this }phézomenon. The effects on the ionosphere of atomic detonations have possible-ap lication in long range detection and ionospheric research as well ask edictions of radio transmission disruptions. fe i | aA repetition of the IVY experiment will be conducted with some extension. Recorders will be operated at sites.located on opposite sides of the blast for the Bikini shots, and (oh‘the same side but at different distances, for the larger Eniwetok|ishdt. For the smaller Sniwetok shot, one recorder will be operated iin the vicinity of the test site, and one at some distance from the site.!| In addition sonic equipment, capable of responding to periods as long! as 10 min, will be operated in order to correlate sonic and ionospherjic effects. + 5.6.3 Remarks The final results will be in the form of photograp vic filn records of oscilloscope traces. The special camera used is as tegral part of the ionosphere recorder. 40