为了研究产生午夜之后电离层F2层增层现象的可能物理机制,基于云南省普洱地区(E101.05°,N22.70°)电离层垂测站的观测数据,采用了频高图固定探测频率回波分析方法即iso-frequency分析法,分析了频高图中不同频率回波虚高的变化趋势和特征.结果表明,该地区午夜之后出现的F2层增层现象和重力波存在一定的联系.此外,顶层电离层或等离子体层的等离子体向下扩展也有助于F2层增层现象的产生.%To study the possible mechanism of the post-midnight stratification of F2 layer, this paper uses the iso-frequency method to study characteristics of variation of different frequencies echoes based on ionograms recorded in Puer area (101.05°E, 2270°N) of Yunnan province.The results show that the post-midnight stratification of F2 layer is mostly due to gravity waves.Additionally, plasma's downward diffusions from topside ionosphere or plasmasphere are also contributed to the formation of the stratification of F2 layer during post-midnight.
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