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04 HOURS 15 day intervals 15-day period 18 kc/s signals 8CTOBER A. C. Murphy Alaska AVEM AVEMAGE C8 PA1H average Boulder Bureau of Standards change in illumination Crary and A. C. D. D. Crombie darkness solid lines day intervals centered day-to-day standard deviations diurnal phase change diurnal phase variation DIURNAL VARIATION effective height gives the percentage H8URS UT Figure I I I I I I I I I I I Illuminated Path ionosphere maximum diurnal phase mean diurnal phase Mean phase variation minute intervals MO81HLY AVEMAGE MON1HLY AVEMAGE C8 monthly National Bureau NBA observed NBS Tech normal phase variations observed at College occurred ordinate also gives path for 15 path in darkness percentage of darkness Phase Stability phase variation dotted plotted in figures QAV 8O Radio Standards rms phase differences Rugby to College signals from NBA sunrise and sunset Sunset Variations variation dotted lines Variation in Diurnal yearly maximum diurnal