Enhancement of cyclotron absorption of plasma oscillations excited by powerful radio wave below multiple electron gyroharmonics Original Research Article

Theoretical research of increase in the cyclotron absorption of upper-hybrid plasma oscillations generated by a powerful radio wave is presented. Such increase occurs at pump frequencies below the harmonic of electron gyrofrequency due to the transformation of the plasma wave energy into a large wave number region which is formed in a magnetized ionospheric plasma under the action of the spatial dispersion. We suppose that proposed mechanism can result in the experimentally observed effect of additional ionosphere ionization appearance below the electron gyroharmonics and can lead to corresponding asymmetry in the effects of ionosphere artificial airglow and plasma noise enhancement caused by accelerated electrons.