wa: 381 0 BEaun) * Project 6.3 ~ Effects of Atomic Explosions on the Ioncepbhere - M. avn ORIEGUYE The objective of Project 6.3 vas to obtain deta on the effects of high yield suclear explosions on the ionosphere. Principally, to investigate the “ """ “greaef abecrptitm, prutully due te the high altitude radioactive partic) vs, end to study the effect of orientation relative to the earth's magnetic field oo F2 layer effects. SRCCTERRETATLGN me eee BEST AVAILAB LE COPY Ive ionosphere recorders, type C-2, operating on pulse transmission, diastelied in 6 ton trailer vans, ene located at Rongerik Atoll and ome loeated ot Eneaie in the Careline Ielanis. Que ionosphere recorder, type C3, operating om pulse trenenissicn, fastelied in a 697 plane based at Enivetok Island. Detailed Descriptica: Tonoepbere recorder site (Rongerik Atoll) site (Russie) AN/CPQ-7, type C-2 ionosphere recorder vith a power cutput ef 10 EW peak pulse alternately tranamitting and receiving automatically over the range of frequencies fram 1 to 25 megacycles. This equipment measures aad records at vertical incidence the virtual height and critical frequencies of ionized regions of the upper atusephere. A GOO ohm multiple wire antenna designed and erected, so that the direction of maximm intensity of redistion will be at the desired vertical angle over all of the operating frequency renge fram] to 23 aegacyelee. Sl &&