The formation of sporadic E layers by a vortical perturbation excited in a horizontal wind shear flow

355 7 1302 1 3889 document 1302 08 Didebulidze angeo 26-1741.pdf application/pdf 636d073cb6b1cfafe8a0d95ba0b4bb04 MD5 736224 2014-01-21 12:28:41 http://eprints.iliauni.edu.ge/355/1/08%20Didebulidze%20angeo%2026-1741.pdf 355 1 1 application/pdf text ge public

08 Didebulidze angeo 26-1741.pdf

1309 2 3910 document 1309 lightbox.jpg image/png 37a88c04f5ee118f9aa9e0271e6d55ad MD5 56168 2014-01-21 13:09:18 http://eprints.iliauni.edu.ge/355/2/lightbox.jpg 355 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox ge public

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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/1302 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/1302 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/1302 archive 24 disk0/00/00/03/55 2014-01-21 16:39:48 2014-01-21 16:39:48 2014-01-21 16:39:48 article show დიდებულიძე გ didebulidze@iliauni.edu.ge ლომიძე ლ levlomidze@gmail.com The formation of sporadic E layers by a vortical perturbation excited in a horizontal wind shear flow pub QC fac_eng public 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 kz6=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 the vertical drift velocity of the ions. It also can explain the multi-layer structure of Es layers. The pattern of the multi-layer structure depends on the value of the shear-wave vertical wavelength, the ion-neutral collision frequency and the direction of the background horizontal wind. The modelling of formation of sporadic E layers with a single and a double peak is presented. Also, the importance of shear wave coupling with short-period atmospheric gravity waves (AGWs) on the variations of sporadic E layer ion density is examined and discussed. 2008 completed Annales Geophysicae 26 7 European Geosciences Union 1741-1749 TRUE ISSN 0992-7689 whttp://ww.ann-geophys.net/26/1741/2008/ http://www.ann-geophys.net pub GNSF/ST07/5-208, INTAS 03-51-6425 and ISTC G-1074 grants