An efficient amplitude fluctuation model for the wave propagation in solar corona based on Rytov´s first iteration method

In this paper, a new numerical model based on Rytov´s first iteration method is implemented to analyze the amplitude fluctuation when the Electromagnetic (EM) waves pass through the solar corona during the superior solar conjunction. Integrated with the geometrical model of the deep space communication, the proposed amplitude fluctuation model incorporates both the solar wind density model and its irregularities spectrum model. In addition, the scintillation index model is further derived from the proposed model, which is normally used to characterize the amplitude fluctuation. Simulation results indicate that the proposed model can quantitatively evaluate the amplitude fluctuation under various scenarios. Besides, the derived scintillation index model achieves better accuracy compared with other models and the measurement data collected by the deep space probe. The good performance in terms of both efficiency and accuracy makes the proposed model is possible applied in forecast the amplitude fluctuation in the deep space communication.