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Alouette project Alouette's altitude antennas Argentina atmospheric molecules atom Australia bouncing Brazil Calif Canadian scien Chile congratulate COOPERATIVE SPACE PROGRAMS cosmic noise curtain data Defence Research Board designed DRTE earth Ecuador electrical charge equipment includes experiment Federal Republic France given electron density Goddard Space Flight GOVERNMENT PRINTING OFFICE half dozen high-energy radiation instruments intensities of high-energy ionosondes ionosphere by radio-echo Italy Japan John launch light maximum electron density miles MINISTER OF CANADA nadian NASA FACTS NASA Thor-Agena NASA's natural radio signals notebook Ontario orbit Ottawa outer space particle Point Arguello Portugal possible world radio PRIME MINISTER prototype radiation in space radio frequency Radio waves radio-echo sounding Rechargeable reflects certain radio region of maximum Republic of Germany Republic of South satellite satellite's scientific scientists solar cells SOUNDING ROCKETS South Africa Soviet Union Space Flight Center SPACECRAFT stations Sweeping tists Topside United Kingdom upper ionosphere Washington 25 world radio communication Zealand