Structural features of the subauroral ionosphere during the origination of the polarization jet |
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| Authors: | A E Stepanov I A Golikov V I Popov E D Bondar’ V L Khalipov |
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| Institution: | 1.Institute of Cosmophysical Research and Aeronomy, Siberian Branch,Russian Academy of Sciences,Yakutsk,Russia;2.Ammosov State University,Yakutsk,Russia;3.Space Research Institute,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Narrow jets of rapid westward ion drifts were registered near the plasmapause projection at the F-region altitudes on the Cosmoc-184 satellite and were called “a polarization jet.” In this work, the effect of this polarization
jet on the ionospheric structure has been studied, using a three-dimensional model of the high-latitude ionosphere, when strong
local magnetospheric electric fields were originated. The calculations indicated that a narrow trough in the latitudinal variations
in the electron density at the F-region maximum was formed in the zone where the electric field was switched on. This trough was more pronounced in the early
evening hours, when the electron background density was still high, and was less distinct at low back-ground levels during
premidnight hours. A comparison of the calculations and experimental data indicated that they were in good agreement with
one another, which made it possible to state that the polarization jet was the main mechanism by which narrow electron density
troughs were formed in the subauroral ionosphere. |
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