eS @ Program 2, Nuclear Radiation and Fallout; Projects @® Program 6, Systems Effects; Projects 6.1, 6.2a, 6.2b, 6.4, 6.5, 6.6 2.1, 2.2, 2.3, 2.5a, 2.5b, 2.6a, 2.6b Program 7, Electromagnetics; Projects 7.1, 7.2, 7.4 Program 9, Cloud Photography; Project 9.1. The locations of the instrument stations for these projects are in Figure 78. Details of each project are given in Chapter 3. aircraft participation is given in Table 37. ghown TG 744 Table 38 indicates the tions of some of these aircraft at burst time. The Test At shot time (0620), a rain shower between the fleet and ground possibly extended to ground zero. about 55,000 feet (16.8 km). zero The debris cloud reached an altitufe of The lowest portion of the stem (estimatkd at below 5,000 feet [1.5 km]) moved to the west at an average velocity o about 17.3 mi/hr (27.8 km/hr). (Contact was made with this portion of cloud at H+5 by Wilson 2, about 59 nmi zero. The intensity was 0,015 R/hr.) (1.5 to 7.6 km) mi/hr 109 km the to the west of ground The middle segments of the clogd initially moved north, then east-northeast at about 1].4 (28 km/hr). The top section of the cloud moved to the east-nor at approximately 34 mi/hr CONTAMINATION. (55 km/hr) (Reference 16, Tab M). The Wilson 1 aircraft encountered radiation intengi- ties of 5 R/hr while collecting cloud samples. Wilson 2, flying at 10,000 feet (3.05 km), made no contact with t cloud while in the racetrack pattern between Bikini and Enewetak/Ujelahg. Wilson 2 began a sector search at H+4 and located the cloud east of grpbund zero. This area was the forecast Ht+6 position of the 20,000- and 30,0p0- foot (6.1- and 9.l-km) particle trajectories. R/he was reported at H+5.5 about 100 nmi A maximum reading of 0. —50 (185 km) east-northeast of Bifini. This layer of the cloud was probably responsible for the contamination[|subsequently noted at Rongerik and Rongelap atolls. 276