OBSERVATION OF THE IONOSPHERIC ELECTRON CONTENT ABOVE AND BELOW THE F₂-REGION PEAK AT WUCHANG, CHINA

【摘要】 <正> Ionospheric electron content results N_F derived from the continuous measurementsof Faraday rotation at Wuchang, China, using ETS-II beacon signal of 136 MHz aredescribed for the period April 1980 through February 1982. In order to find outthe contribution of the electron content N_b below the F₂ peak to the ionosphericelectron content N_F, more than 2500 ionograms obtained simultaneously at the samestation are analyzed. The daily variation of N_F, N_b and the peak density N_max showthat the wave-like disturbances sometimes are very different at different altitudes asis expected from the propagation theory of atmospheric gravity waves, and theirseasonal varistions show clearly the characteristics of both the Appleton anomaly andthe December anomaly. The ratio N_a/N_b is affected by the height variation of maxi-mum net ion production during the daytime and by the change of exospheric tempera-ture in the period 1200-2200 LT.更多还原

【Abstract】 Ionospheric electron content results N_F derived from the continuous measurementsof Faraday rotation at Wuchang, China, using ETS-II beacon signal of 136 MHz aredescribed for the period April 1980 through February 1982. In order to find outthe contribution of the electron content N_b below the F₂ peak to the ionosphericelectron content N_F, more than 2500 ionograms obtained simultaneously at the samestation are analyzed. The daily variation of N_F, N_b and the peak density N_max showthat the wave-like disturbances sometimes are very different at different altitudes asis expected from the propagation theory of atmospheric gravity waves, and theirseasonal varistions show clearly the characteristics of both the Appleton anomaly andthe December anomaly. The ratio N_a/N_b is affected by the height variation of maxi-mum net ion production during the daytime and by the change of exospheric tempera-ture in the period 1200-2200 LT.更多还原