Abstract
To resolve conflicting reports concerning smooth type waveforms, over 250 traces were extensively examined, as exemplifying wave-guide pulse dispersion. With very precise measurement, regular traces and those having various minor irregularities were distinguished. Over half the waveforms had regular traces and were directly explicable but analysis, accurate enough to give independent values of ionosphere height and propagation distance, was unattainable. Independent estimates of storm distances from a Sferics network suggested unexpected constancy of ionosphere height at 83 ± 2 km by day and night. Amplitude analysis gave identical average source spectra for day- and night-time waveforms and indicated unsuspectedly trivial variations of attenuation with frequency in the range 4–10 kc/s, and for the day to night transition.
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