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Published online by Cambridge University Press: 14 August 2015
The occurrence of increased radio noise at the onset of short-wave fadeouts (SWF's) was noted by Appleton [1], who attributed the enhancements to solar emission. Payne-Scott [2], observing at about 19 Mc/s, measured burst intensities and times of occurrence to compare these high-frequency phenomena with radio events in the VHF range from 50 to 100 Mc/s.