The wave forms of the electric field of atmospherics recorded at four widely separated stations are analyzed to yield the phase characteristics of radio waves at very low frequencies. It is indicated that the relative phase velocity for propagation to great distances is about 3 per cent greater than c (velocity of light in a vacuum) at 4 kc/s. Above this frequency, it gradually decreases, being about 1 per cent greater than c at 8 kc/s. The form of the dispersion curve is very close to that predicted by the mode theory.
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Jean et al. (1960) studied this question.
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