Abstract
The decay instability of an ordinary hf electromagnetic pump wave into quasitransversal upper hybrid (UH) and lower hybrid (LH) waves in the ionosphere is discussed. The longitudinal and transversal inhomogeneity of the medium is taken into account. It is shown that, due to the decay instability within weak plasma density enhancements, a rather broad spectrum of UH oscillations, similar to the spectrum of the downshifted maximum (DM) in stimulated electromagnetic emission (SEE) spectra, is formed. Estimates of the frequency range and characteristic k numbers of the DM spectrum are given.
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