Abstract
A simple second-order correction to the first-order Faraday rotation equation has been obtained from the Appleton-Hartree equation which depends on the inverse fourth power of the signal frequency, and which can be of appreciable size in the region of quasiansverse propagation through the ionosphere. It is shown that if the computations of the total ionospheric electron content are done by using the difference of the angular rotations for two closely-spaced frequencies, instead of the total rotation for a single frequency, then the correction term can be eliminated to a good approximation, which is in agreement with experimental observations.
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