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利用一个时变电离层理论模式，研究武昌地区（３０．５°Ｎ，１１４．４°Ｅ）电离层Ｆ_１－ｌｅｄｓｅ现象．表明利用当前关于中性气体和太阳辐射的经验模式，观测到的Ｆ_１－ｌｅｄｇｅ出现与演化的基本规律将可基于现有电离层理论加以再现．指出较明显的Ｆ_１－ｌｅｄｇｅ结构同较低的中性原子－分子含量比有直接关系，并同原子－分子成份的过渡高度、背景温度及其垂直分布形态有一定联系．同Ｆ_１－ｌｅｄｇｅ形态相关联的Ｆ_１－Ｆ_２谷，其出现主要是由于亚稳态氧离子参与光化过程，以及电离气体参与具有一定垂直变化的输运过程．
A time-varying ionospheric model was used to study the F_1-ledse ionosphere in Wuchang area (30.5 ° N, 114.4 ° E). It shows that with the current empirical models of neutral gas and solar radiation, the observed fundamental law of F_1-ledge occurrence and evolution will be reproduced based on the existing ionospheric theory. It is pointed out that the obvious F_1-ledge structure is directly related to the lower neutral atom-to-molecular ratio, and it is also related to the transition height of atom-molecule components, the background temperature and its vertical distribution. The F_1-F_2 valleys associated with the F_1-ledge morphology are mainly due to the metastable oxygen ions participating in the photochemical process and the ionized gases participating in the transport process with a certain vertical variation.