Anomalous absorption and electron acceleration in parametric instabilities

Three topics were studied. First, the trajectories of charged particles in turbulent electric fields were investigated. Secondly, electron acceleration by parametrically excited waves, and finally, radio wave absorption caused by observed ionospheric irregularities were studied. A one-dimensional numerical study of charged particle trajectories in turbulent electrostatic wave fields is made. Weak fields produce particle diffusion. For strong turbulent wave fields, the motion of the charged particle was studied over many trapping periods. Transitions between three velocity states, namely the trapped state, and the states of high and low velocity characterize the motion which does not resemble diffusion on any time scale