Research on Non-uniform Nested Grid FDTD Method Based on Ionospheric Zakharov Model

This paper, based on plasma generalized Zakharov model in ionosphere, studies the non-uniform nested grid in FDTD algorithm under plasma background. It is used to improve the FDTD algorithm for studying the nonlinear process of the ionospheric Langmuir disturbance. A non-uniform nested grid method which can reduce the computational complexity of explicit FDTD algorithm while guaranteeing the computational accuracy is studied. A non-uniform nested grid FDTD method for calculating electromagnetic problems involving different orders of magnitude is proposed. Finally, the correctness and superiority of the non-uniform nested grid are verified by simulating the electromagnetic field distribution and propagation characteristics of the ionospheric Langmuir disturbance.