Abstract
The polarization twist imposed on VHF radio waves by the ionosphere has been investigated by many workers using the moon as a reflector, the purpose being to determine the total electron column density. The difficulty in using only one frequency is the impossibility of an exact determination of the total electron content because the Faraday rotation is ambiguous in multiples of π. But I have shown recently that at daytime the electron content n0 should vary with , when the ionosphere is undisturbed, where ÷ means the zenith angle of the ionizing solar radiation. Plotting the Faraday rotation against is not a result of trying to find or proving a good agreement, but it is the result and a strong consequence of my new model for the F layer [Burkard, 1961].
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