euro-optics-plasma-science-2018-posters

Laser Optics & Photonics and Atomic & Plasma Science 2018

J u l y 1 6 - 1 7 , 2 0 1 8

P r a g u e , C z e c h R e p u b l i c

Page 86

American Journal of Computer Science and Information Technology

ISSN: 2349-3917

E u r o S c i C o n J o i n t E v e n t o n

Laser Optics & Photonics and

Atomic & Plasma Science

he linear generation, intensification and further dynamics of internal gravity waves (IGW) in the ionosphere with non-uniform

zonal wind (shear flow) is studied. In case of the shear flows the operators of linear problem are non-selfadjoint, and the

corresponding Eigen functions are nonorthogonal. Thus, canonical - modal approach is of less use studying such motions. Non-

modal mathematical analysis becomes more adequate for such problems. On the basis of non-modal approach, the equations

of dynamics and the energy transfer of IGW disturbances in the ionosphere with a shear flow is obtained. It is revealed that

the transient amplification of IGW disturbances due time does not flow exponentially, but in algebraic - power law manner. The

frequency and wave-number of the generated IGW modes are functions of time. Thus in the ionosphere with the shear flow,

a wide range of wave disturbances are produced by the linear effects, when the nonlinear and turbulent ones are absent. The

effectiveness of the linear amplification mechanism of IGW at interaction with non-uniform zonal wind is analyzed. It is shown

that at initial linear stage of evolution IGW effectively temporarily draws energy from the shear flow significantly increasing (by

order of magnitude) own amplitude and energy.

Low frequency internal-gravity wavy structures

in the shear flow driven ionosphere

K Z Chargazia, O Kharshiladze, G Zimbardo, D Kvaratskhelia, N

Javakhishvili and K Gomiashvili

I Javakhishvili Tbilisi State Univerity, Georgia

Am J Compt Sci Inform Technol 2018, Volume 6

DOI: 10.21767/2349-3917-C1-003