We present measurements of stimulated electromagnetic emission (SEE) excited in the ionosphere by a powerful high-frequency ordinary mode radio wave vertically injected from a ground-based transmitter, at frequencies f₀ near high harmonics of the ionospheric electron cyclotron frequency fc. A prominent lower-sideband SEE feature was found to be absent in an extremely narrow f₀ range of {Δ}f₀/f₀{}2×{}10^-5. This absorption resonance width allows an estimate of fc with an accuracy of a few tens of Hz, corresponding to a magnetic field magnitude accuracy of about 1 nT.
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Leyser et al. (1992) studied this question.
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