Abstract
The calculation results and experimental data on the formation and development of a polarization jet in subauroral latitudes are compared. It is shown that the alternation of vertical and horizontal components of the ionospheric plasma–drift velocity leads to different variations in the main parameters of the F2 layer. An increase in the critical frequency of the F2 layer is revealed in certain cases before the formation of a polarization jet. This behavior of the F2 layer may be caused by a decrease in the rate of the recombination of charged particles due to an increase in the altitude of the layer maximum, which results in particle accumulation at these altitudes. An increase in the critical frequency of the F2 layer can be an additional indicator of the development of a polarization jet over an observation station.
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