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Multilayered Structures In The Ionosphere F2 Region And Impulse-Like Increase Of The Nightglow Red 630 Nm Line Intensity As A Result Of Influence Of Shear Excited Atmospheric Vortical Perturbations, G. G. Didebulidze, Levan Lomidze, N. B. Gudadze, M. Todua
Multilayered Structures In The Ionosphere F2 Region And Impulse-Like Increase Of The Nightglow Red 630 Nm Line Intensity As A Result Of Influence Of Shear Excited Atmospheric Vortical Perturbations, G. G. Didebulidze, Levan Lomidze, N. B. Gudadze, M. Todua
Levan Lomidze
It is shown that the formation of multilayered structures in the midlatitude ionosphere F 2 layer can be caused by atmospheric vortical perturbation (shear wave) evolving in the meridional wind with linear zonal shear and can be accompanied by an impulse-like increase (with duration about 1–3 h) in the red 630 nm line total nightglow intensity. The shear wave can produce an enhancement of the northward wind (or decrease in the southward one), which can cause a downward motion of the F 2 layer peak height resulting in the impulse-like increase in the red line intensity. An important increase in …
The Formation Of Sporadic E Layers By A Vortical Perturbation Excited In A Horizontal Wind Shear Flow, G. G. Didebulidze, Levan Lomidze
The Formation Of Sporadic E Layers By A Vortical Perturbation Excited In A Horizontal Wind Shear Flow, G. G. Didebulidze, Levan Lomidze
Levan Lomidze
The formation of the mid-latitude sporadic E layers (Es layers) by an atmospheric vortical perturbation excited in a horizontal shear flow (horizontal wind with a horizontal linear shear) is investigated. A three-dimensional atmospheric vortical perturbation (atmospheric shear waves), whose velocity vector is in the horizontal plane and has a vertical wavenumber kz≠0, can provide a vertical shear of the horizontal wind. The shear waves influence the vertical transport of heavy metallic ions and their convergence into thin and dense horizontal layers. The proposed mechanism takes into account the dynamical influence of the shear wave velocity in the horizontal wind on …
Different Long-Term Trends Of The Oxygen Red 630.0 Nm Line Nightglow Intensity As The Result Of Lowering The Ionosphere F2 Layer, N. B. Gudadze, G. G. Didebulidze, Levan Lomidze, G. Sh. Javakhishvili, M. A. Marsagishvili, M. Todua
Different Long-Term Trends Of The Oxygen Red 630.0 Nm Line Nightglow Intensity As The Result Of Lowering The Ionosphere F2 Layer, N. B. Gudadze, G. G. Didebulidze, Levan Lomidze, G. Sh. Javakhishvili, M. A. Marsagishvili, M. Todua
Levan Lomidze
Long-term observations of total nightglow intensity of the atomic oxygen red 630.0 nm line at Abastumani (41.75° N, 42.82° E) in 1957–1993 and measurements of the ionosphere F2 layer parameters from the Tbilisi ionosphere station (41.65° N, 44.75° E) in 1963–1986 have been analyzed. It is shown that a decrease in the long-term trend of the mean annual red 630.0 nm line intensity from the pre-midnight value (+0.770±1.045 R/year) to its minimum negative value (−1.080±0.670 R/year) at the midnight/after midnight is a possible result of the observed lowering of the peak height of the ionosphere F2 layer electron density hmF2 …