Research On The Drift Velocities Of Ionosphere And Ionospheric Irregularities Inversion

Ionosphere is a non- linear response system, and different kinds of input will trigger different final perturbations, which leads to the different influence on the radio wave propagation. F-region is one of the most important region in the ionosphere, and the ionospheric irregularities will result in phase scintillation and amplitude scintillation for nearly all- frequency radio waves propagating through the ionosphere. Here, it is very important to investigate on ionospheric irregularities generation, evolution, shape distribution and the influence of the waves.Firstly, based on the theory of weak scintillation in the ionosphere, i.e. phase screen theoty, ionospheric irregularities drift velocity of the ionosphere is obtained by the processing of the receiving scintillation signal from ground-base station and estimation of the power spectrum. Emphasis is put on studying how to use suitable power spectrum estimation method to calculate the drift velocity of ionosphere irregularities. Then by correlation analysis the GPS data observed with three ground stations at intervals, the delay time of the three GPS scintillation signals is got which can be used to calculate the horizontal drift velocity of ionosphere irregularities. And the method is improved and compared with the method of power spectrum analysis. Finally, the least square method can used to calculate drift velocity of the ionosphere by analysis the frequency shift and phase cha nge of the receiving signals from digisondes. By using the data observed with TR169 station(o oE19.2,N69.6), JI91 J station(o oW76.8,S12.0) in 2010 and Zhongshan station(o oE76.4,S69.4) in 1995, the ionosphere drift velocity is calculated and analyzed mainly about statistical property, the changing with seasonal changes and the influence of Kp index and solar activity.