Judging from these and other ionospheric features over Wuchang, the lunar effect may serve as a common source.
联系武昌上空电离层其它某些参量的共同特点，有可能月致效应是其共同的推动源。
2
The main effect on the GPS signals of ionosphere and ionospheric refractive model are researched in this paper; then the dual-frequency corrected model of ionospheric refractive error is concluded.