- S9 iil. 440 4s Project 6.3 - Effects of’Atomic Explosion on the Ionosphere M. Hawn QBIFCT The objective of Proja-t 6.3 1a to obtain data on the effecte of high yield nuclear explosions on the Ionosphere. Principally, to investigate the area of absorption, probably due to the high altitude radioactive particles, ami to stuly the effest of orien tation relative to the earth's magnetic field on F2 layer effects, INSTRUMPNTAT [ON The system comprises: Two Ionosphere recorders, type Co2, operating on pulse trensmission, instelhked in ¢ ton trailer vans, one located at Rongerik Atoll anid one Lona’ ai a? Koante tn the Carvine Islents, One Ionosphere recorier, type “-3, cperating on pulse tranamission, installed in a C-97 plane base] at Miive’.ok Island. Detaiie! Jeserip-don: Tonosphere recorier site (~ongerix Atoll) site (Xusaie) AN/CPQ-", type Ca2 Jonosphere re-ories with a power output of 10 KW peak pulse alternately transmitting ant receiving automatically over the ranve of frequencies from 1 to 25 megacycies. This equipment measures ani recoris at vertioal incidence the virtual heigit and critical frequencias of fonizad regions of the upper atmosphere. A 600 ohm multip.e wire entenna jJesigned and erected, so that the Alrection of maximum intensity of radiation will be at the desired BEST AVAIL- A0B- LE COPY canevtey vertical @ngia over all of the operating fraquency range “rom 1 to 23 mr Re