| I (eee Games of fran one to 25 mcs. This entire range is swept in a period of about 15 seconds, and will be repeated in this frequency fran time to time. After the shot we will do it more frequently. Then there is normal operation, which is five times an hour. The equipments will be located at the weather stations, on Rongerik Atoll, and at Bikini and at Kusaie. This will be the first time we have operated at the north or south of a shot. We expect this will give us some information concerning the effects as. related to the earth's magnetic field, which has a large influence on movements of ions in the upper atmosphere. In addition, we have gotten the AFCRC to participate with us; they will provide a plane, which contains one of these vertical in- cidence recorders mounted in the plane. The plane will have to be based at Kwajalein because of no roan at Eniwetok, Later we hope to move to Eniwetok, because it is nearer the center of operations, and will enable us to compare our data; that will be our center. The flight plan of the plane has not been determined, but we hope to cover an area to the north and east or to the south and east of the large shots at Bikini to enable us to find the extent of the effect. During CASTLE we had dif- ferent results at Rongerik from the different shots at Bikini, and we hope to get enough information fran these two graph stations and the plane station to give us this complete theory; that is one objective of our experiment. The other objective will be to get more data about phenanena which we found during CASTLE. During CASTLE, in addition to having a ground station at Rongerik, we had a ground station at Parry Island, and there the radio frequency signals fran the ionosphere were completely absorbed for several hows after the shot, ani we believe this absorption of the signals occurred in the region about 20 or 25 miles up, and the explanation that we postulated was that the radioactive particles from these shots which rose 100,000 to 125,000! were carried to the west by winds which prevail in those latitudes. High winds prevail in the order of 60 to 90 knots, and would be enough to bring those particles over Eniwetok in about two hours. For most of the large shots, we observed a complete blackout starting at about two hours, fran the ionosphere. The absorption which would occur according to this theory is caused by the radioactive particles remaining in that vicinity, so another possible result of this experiment will be to find the extent of the area involved. In this absorption phenomena we expect to operate the plane during all the large shots, am the graph stations will be there anyway, so I see no reason why we shouldn't run during the small shots, and possibly get sone information to corroborate the previous information about effects during kt shots. We expect to have about three personnel at Rongerik, and about three personnel at Kusaie, and our headquarters will be at Parry, amd there we will have five personnel at sane time or other, The recorders will record the information from the oscillosceopes on film and the film will be scaled by the personnel on Parry Island. In addition, there will be three scientific personnel in the air- craft. That makes a total of 1) people, This does not count the air crew which will run about 10 or 12, and will be stationed at Kwajalein and Eniwetok. The construction requirements were sent in two days ago. They just consist of clearing an area at Rongerik and at Kusaie, ami setting four small poles at each location for the antenna. Eonar si — é