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利用计算机模拟研究了不同条件下中纬电离层F区大尺度扰动的时空演变.当存在幅度约为5％的初始扰动时,Perkins不稳定性能发展成为大尺度电离层不均匀体.大气重力波能触发Perkins不稳定性,在更短时间内增长成为大幅度电离层振荡.非均匀局部电场结构也能产生局部电离层的大幅度扰动.本义的模拟表明,中纬电离层大尺度扰动主要表现为磁通管内等离子体沿磁力线的振荡.模拟结果与观测现象符合得很好.
The space-time evolution of the large-scale perturbation in the ionosphere F at different latitudes is studied by computer simulation. When there is an initial perturbation of about 5%, the Perkins instability develops into a large-scale ionospheric heterogeneity. Which can trigger Perkins instability and grow into a large ionospheric oscillation in a shorter period of time.The non-uniform local electric field structure can also produce large-scale perturbation of the local ionosphere.The simulation of the original meaning shows that the large-scale disturbance in the mid-latitude ionosphere mainly manifests It is the oscillation of the plasma along the magnetic flux in the flux tube. The simulation result is in good agreement with the observation.