Analysis of the structure of the ionospheric F-layer near the main ionospheric trough by the method of satellite radiotomography

Experimental distributions of the electron density in the ionosphere obtain ed by the method of satellite radiotomography are analyzed. The data were c ollected in the course of the Russian-American Tomography Experiment (RATE) in 1993 and the International Campaign in northern Scandinavia in 1995. Th e results of reconstruction of the data by both experiments contain the lat itude-altitude distributions of electron density in the F-region near the M ain Ionospheric Trough. A two-dimensional multicomponent mathematical model of the high-latitude ionosphere developed in the Polar Geophysical Institu te was used to interpret irregularities of the electron density.