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ABNORMAL IONIZATION IN THE LOWER IONOSPHERE ASSOCIATED WITH COSMIC-RAY FLUX ENHANCEMENTS
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DISTURBANCES IN THE LOWER IONOSPHERE OBSERVED AT VHF FOLLOWING THE SOLAR FLARE OF 23 FEBRUARY 1956 WITH PARTICULAR REFERENCE TO AURORAL-ZONE ABSORPTION
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SOME MEASUREMENTS OF HIGH-LATITUDE IONOSPHERIC ABSORPTION USING EXTRATERRESTRIAL RADIO WAVES
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OBSERVATIONS OF ABNORMAL VHF RADIO WAVE ABSORPTION AT MEDIUM AND HIGH LATITUDES
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