F2 layer F2层
Peak density of F2 layer F2区临界频率
peak altitude of F2 layer F2区峰值高度
The morphology of F2 layer during the solar eclipse is examined, and the mechanism of its formation is discussed theoretically.
本文着重考察了日全食时F_2层的形态，对其形成机制进行了理论探讨。
During ionospheric storm periods, the existing prediction methods for the critical frequency of ionospheric F2 layer(foF2) can not satisfy the requirements of the practical applications.
在电离层风暴期，现存的电离层F2层临界频率预测方法不能满足实际应用的要求。
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