| Summary: | To improve the accuracy of predicting the ionospheric critical frequency of the F2 layer (<i>f</i><sub>o</sub>F<sub>2</sub>), a reconstruction method for the spatial map of the ionospheric <i>f</i><sub>o</sub>F<sub>2</sub> based on modified geomagnetic dip coordinates is proposed. Based on the strong correlation between the ionospheric <i>f</i><sub>o</sub>F<sub>2</sub> and geomagnetic coordinates, the variation function of ionospheric distance is built. In the end, the spatial map of the ionospheric <i>f</i><sub>o</sub>F<sub>2</sub> is predicted by solving the Kriging equation. The results show that the regional characteristics of the ionospheric <i>f</i><sub>o</sub>F<sub>2</sub> analyzed by the proposed method are consistent with the observations. Compared with the reconstructed value of <i>f</i><sub>o</sub>F<sub>2</sub> using traditional geographic coordinates, the root-mean-square error (RMSE) in high solar activity years decreased by 0.43 MHz, and the relative RMSE decreased by 5.48%; The RMSE decreased by 0.35 MHz during low solar activity which is 5.99% lower to relative RMSE. The research results provide support for high-frequency communication frequency selection.
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