The remote HF-Doppler detection of the sunrise effect

The information about the ionospheric change is of great significance for the research of geophysical phenomenon and the communication guidance. In this paper, according to the year-round data of the HF-Doppler detection of the ionosphere, we induced and generalized the curves of Doppler frequency shift during the sunrise and analyzed the basic characteristic and the rule of the daily and seasonal variation of the Doppler detection of the sunrise effect.