Abstract
Abstract. Tomographic images of the spatial distribution of electron density in the ionospheric F-region are presented from the Russian-American Tomography Experiment (RATE) in November 1993 as well as from campaigns carried out in northern Scandinavia in November 1995 and in Russia in April 1990. The reconstructions selected display the ionisation troughs above the tomographic chains of receivers during geomagnetically quiet and disturbed periods. Two mathematical models of the high-latitude ionosphere developed in the Polar Geophysical Institute have been applied for interpretation of the observed tomographic images.Key words. Ionosphere (electric fields and currents; ion chemistry and composition; plasma convection)
Highlights
The ionospheric ionisation trough is one of the most outstanding features of the subauroral ionosphere
The satellite radio tomography providing images of ionospheric electron density has been successfully used in the Polar Geophysical Institute during the last decade
Two models of high-latitude ionosphere developed in the Polar Geophysical Institute have been presented
Summary
The ionospheric ionisation trough is one of the most outstanding features of the subauroral ionosphere. It appears within a longitudinally elongated narrow strip equatorwards of the auroral zone. In the present study an interpretation of the structure of the trough is described using selected data sets obtained during three tomographic campaigns. Two different mathematical models of the high-latitude ionosphere are applied which allow the interpretation of the observed irregular structures in the vicinity of the trough. These models are based on earlier ones which have been modified to meet the aims of the present study. The spatial variables in the model are altitude and distance in meridional direction
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