Nonlinear Effects in the Upper Ionosphere

Abstract

Dynamic properties of ionospheric plasma turbulence driven by high-power high-frequency radiowaves S M Grach, E N Sergeev, E V Mishin et al.-Vortices in nonuniform upper-hybrid field T A Davydova and J Vranjes-Parametric decay of X-mode radiation into electron Bernstein and lower hybrid waves in a plasma A Kumar and V K Tripathi-Recent citations Effects of the Hall Conductivity in Ionospheric Heating Experiments B. Tulegenov and A. V. Streltsov-Vladislav Dementyev et al-Denis Kogogin et al-This content was downloaded from IP address 128.173.148.28 on 09 Abstract. The review is based on a report presented by the author at the RAS Physical Sciences Division's session in honor of Vitaly L Ginzburg's 90th birthday. It examines the current status of theoretical and experimental research on non-linear phenomena arising when a powerful radio wave propagates in the ionosphere. The focus is on the modification of the ionosphere under the resonance excitation of natural plasma oscillations by radio waves. The upper-hybrid resonance gives rise to strong upper-and lower-hybrid plasma waves; excites strongly elongated ionospheric irregularities, and induces artificial ionospheric radio emission. Nonlinear processes are found to undergo complete transformation near double resonances, when the upper-hybrid frequency is close to a multiple of the electron gyromagnetic frequency. In the neighborhood of the Langmuir resonance, intense plasma waves and ion-sound waves are excited, electrons are effectively accelerated, and an artificial glow of the ionosphere appears.