Transfer of Drift Wave Turbulence Energy to Langmuir Waves in Inhomogeneous Magnetospheric Plasma

Drift waves exist universally in inhomogeneous plasmas and play a major role in the cross-field transport of particles, energy, and momentum in space and laboratory plasmas. In this article, we present our investigation on the amplification of the Langmuir waves in the presence of the drift wave turbulent field through nonlinear wave particle interaction process called the plasma-maser effect. The drift wave turbulent field interacts with plasma particles as it is in the resonant mode and its energy is transferred to accelerate the plasma particles. The accelerated plasma particles transfer their energy to Langmuir waves through a modulated field. We have obtained Fourier components of drift wave turbulent field and the non-linear Langmuir waves using linearized Vlasov-Poisson system of equations. From the non-linear dispersion relation of Langmuir waves, we have calculated growth rates of the Langmuir waves using observational data set of the topside polar ionosphere of the Earth's magnetosphere. The calculations demonstrate that Langmuir waves amplification is feasible at the expense of collisionless electron drift wave turbulent energy.