wah mr: a7 (Imca) Project 6,3 - Effects of Atomic Explosion on the Ionosphere - M. A. Hawn OBJECTIVE The objective of Project 6.3 is to obtain dete on the effects of high yield nuclear explosions on the Jonosphere. Prinaipally, to investigete the area of sbeorption, probebly due to the high altitude radicective particles, and to study the effect of orientation relative to the earth's magnetic field on F2 layer effects. SESTRIRGETATICN The_syatemcomrizes: Two Ionosphere recorders, type C-2, operating on pulae transmission, installed in 6 ton trailer vans, one located at Rongerik Atoll and one located at Euseie in the Caroline Islands. One Ionosphere recorder, type C-3, operating on pulse trananissico, installed in a G97 plane based at Enivetok Island. Description: Ionosphere recorder site (Rongerik Atoll) ite (Kusaie) AH/CPQ-7, type C-2 Ionosphere recorder with a power output of 10 KW peak pulse alternately tranmitting ond receiving automstically over the range of frequencies from ] to 25 megacycles, This ecuippent measures and records at vertical incidence the virtual height and critical frequencies of fonised regions of the upper atmosphere. A 600 ohm multiple wire antenna designed and erected, #0 that that the direction of maximum intensity of rediation will be et the BEST AVAILABLE COPY -3jl- oo = . FT