Gradient drift instability as a source of spread <Emphasis Type="Italic">F</Emphasis> in the region of large-scale irregularities in the low-latitude topside ionosphere |
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| Authors: | Yu A Sukovatov A T Karpachev V A Telegin |
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| Institution: | (1) Bauman Moscow State Technical University, 2-nd Baumanskaya Street, 5, Moscow, 105005, Russia; |
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| Abstract: | The expression for the increment of instability and decrement of diffusion damping of gradient drift waves for ionospheric
altitudes above the F
2 layer maximum is obtained. The gradient drift instability is used to interpret the observations of spread F in the region of large-scale horizontal irregularities of the electron density. Two types of such irregularities observed
on board the Intercosmos-19 (IC-19) satellite in the region of low latitudes (a peak of the density in the dusk ionosphere
and a trough of the density in the dawn ionosphere) are considered. It is shown that the observed gradients of the density
and electric field values in the dawn and dusk ionospheric sectors are quite sufficient for the instability development criterion
to be satisfied in both considered cases. |
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