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RECOMBINATION IN THE LOWER IONOSPHERE
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ELECTRON DENSITY IN THE E-LAYER DURING AURORAL DISPLAYS DEDUCED FROM MEASUREMENTS OF ABSOLUTE BRIGHTNESS OF THE AURORAL LUMINOSITY
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EXCITATION PROCESSES IN THE AURORA AND AIRGLOW .1. ABSOLUTE INTENSITIES, RELATIVE ULTRA-VIOLET INTENSITIES AND ELECTRON DENSITIES IN HIGH LATITUDE AURORAE
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