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GLOBAL BEHAVIOR OF IONOSPHERE AT 1000-KILOMETER ALTITUDE
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QUIET IONOSPHERE OVER SINGAPORE DURING 1962
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COLTON E, 1965, 2 S RAD ASTR SAT STU, P45
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THE EQUATORIAL F-REGION OF THE IONOSPHERE
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TEMPORAL AND SPATIAL CHANGES OF ELECTRON CONTENT OF IONOSPHERE
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JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS,
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EVANS JV, 1967, SOLAR TERRESTRIAL PH, P288