Detection of a large-scale irregularity in the region of the main ionospheric trough according to the data of topside sounding on board the Intercosmos-19 satellite |
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Authors: | A T Karpachev G A Zhbankov V A Telegin |
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Institution: | 1.Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation,Russian Academy of Sciences,Troitsk, Moscow oblast,Russia;2.Research Institute of Physics,Southern Federal University,Rostov-on-Don,Russia |
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Abstract: | Complicated ionograms of topside sounding on board the Intercosmos-19 satellite, which were registered on November 26, 1980,
in the dusk sector (1800 LT) at the latitudes of the equatorward wall (55°–62° ILAT) of the main ionospheric trough (MIT),
are analyzed. They are characterized by the presence of two extra traces at distances larger than the main traces. Approaching
the MIT minimum, all traces become more scattered, converge, and join into one strongly diffusive trace. An attempt of interpretation
of the complicated ionograms on the basis of trajectory calculations performed by the method of characteristics in the “complex”
two-dimensional version (in two mutually intersecting planes) is undertaken. The modeling shows that the extra traces could
be related to the presence of a large-scale irregularity stretched along the geomagnetic meridian at the equatorward wall
of the MIT. The calculations make it possible to estimate the parameters of the irregularity: the intensity is δfoF2 ∼ 30%, the length is several hundred kilometers, the semi-thickness is 50–60 km, and the height is 350 km. The possible
formation causes of the irregularity are discussed. The intensification of the diffuseness of all traces is related to the
increase in the intensity of small-scale irregularities, which is usually observed when approaching the MIT minimum. |
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