武昌电离层峰以上和峰以下电子含量之间的联系

本文利用武昌站（30.5°N,114.4°E）电离层测高仪和ETS-Ⅱ同步卫星信标法拉第旋转仪的同时观测记录,初步分析了电离层峰以上和峰以下电子含量之间的统计联系,并讨论了这种联系在电离层模式研究与电离层上部扰动研究以及电离层上部电子含量预测等方面的可能应用。

RELATIONS BETWEEN IONOSPHERIC ELECTRON CONTENTS ABOVE AND BELOW h_mF_2 AT WUCHANG

In this paper, a statistical analysis is made on the ionospheric electron contents above and below hmF2, Na（t） and Nb（t）, by processing the simultaneous ionograms and BTS-II satellite beacon measurements at Wuchang （30.5°N, 114.4°B）. It is found that during local time 23h-07h Na（t） and Nb（t） vary almost synchronously; while during local time 08h-22h the variation of N*（t） lags behind that of Nb（t）, the cross-correlation coefficient of Na（t） and Nb（t）, P（r）, reaching its maximum for the delay time τ 1.5-2.0 hours, and the vector diagrams of Na（t） and Nb（t） showing an elliptic or gourd-like shape. The ratio of topside and bottom-side ionospheric electron contents exhibits regular diurnal variations and, on an average, the diurnal ratio ranges from about 1.7 to 3.5; the median of monthly averaged ratio is 2.37. The relation between Na（t） and Nb（t） is expressed by a simple empirical equation, which is a good fit to the observed data, with standard deviations of the residual TEC less than 8.0 × 1016 el/m2 at almost all of the local hours. The potential applications of that empirical equation in, e.g., modeling ionosphere, studying the ionospheric dynamic processes as well as real-time estimating the topside ionospheric electron contents from the bottom-side ionograms are also discussed.