ao DELETED (SEMINOLE) Project 6.3 - Effects of an Atomic Explosion on the Ionosphere = M, Hawn OBJECT The objective of Project 6.3 is to obtain data on the effects of high yield nuclear explosions on the Ionosphere. Principally, to in- vestigate the area of absorption, probably due to the high altitude radioactive particles, and to study the effect of orientation relative to the earth's magnetic field on F2 layer effects, 'F INSTRUMENTATION The system comprises: Two Ionosphere recorders, type C-2, operating on pulse transmission, installed in 6 ton trailer vans, one located at Rongerik Atoll and one located at Kusaie in the Caroline Islands. One Ionosphere recorder, type C-3, operating on pulse transmission, installed in a C-97 plane based at Eniwetok Island. RESULTS No observable effect upon the ionosphere was detected on COp; LaneRgret aT. SEMINOLE,