Physics
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11403312d&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A3, CiteID A03312
Physics
Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Ionospheric Dynamics, Ionosphere: Ionospheric Irregularities, Atmospheric Processes: Acoustic-Gravity Waves
Scientific paper
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 red line intensity occurs until the appearance of the secondary peak below the F 2 layer main peak close to the luminous layer. The observed impulse-like increase of the red line intensity followed by oscillations characteristic of short-period atmospheric gravity waves (AGWs) is considered as a possible result of transformation of shear excited three-dimensional vortical perturbation (shear wave) into AGW. The possibility of the appearance of the multilayered structure in the ionosphere F 2 region and the impulse-like increase in the red line intensity under the influence of shear excited waves with vertical wave number k z ≠ 0 is demonstrated analytically and numerically.
Didebulidze G. G.
Gudadze N. B.
Lomidze L. N.
Todua M. M.
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