Please use this identifier to cite or link to this item: http://openlibrary.ge/handle/123456789/7101
Title: Impact of the Zonal Flows on the Relative Short-Scale ULF Electromagnetic Waves in the Shear Flow Driven Ionosphere
Authors: Chargazia, Kh., Z.
Keywords: Geophysics
Journal
ULF electromagnetic waves
Short-scale turbulence
Issue Date: 2017
Citation: Journal of the Georgian Geophysical Society, Iss. B, Physics of Atmosphere, Ocean and Space Plasma, ISSN: 1512-1127, v. 20B, Tb., 2017, pp. 3-10.
Abstract: Influence of the large-scale zonal flows and magnetic fields on the relative short-scale ULF electromagnetic waves in the dissipative ionosphere in the presence of a smooth inhomogeneous zonal wind (shear flow) is studied. A broad spectrum of Alfvenic-like electromagnetic fluctuations appears from electromagnetic drift turbulence and evidence of the existence of magnetic fluctuations in the shear flow region is shown in the experiments. In present work one possible theoretical explanation of the generation of electromagnetic fluctuations in DW-ZF systems is given. For shear flows, the operators of the linear problem are non-selfconjugate and therefore the eigenfunctions of the problem are non-normal. The non-normality results in linear transient growth with bursts of the perturbations and the mode coupling, which causes the generation of electromagnetic waves from the drift wave–shear flow system. We show that the transient growth substantially exceeds the growth of the classical dissipative trapped-particle instability of the system. Excitation of electromagnetic fluctuations in DW-ZF systems leads to the Attenuation-suppression of the short-scale turbulence.
URI: http://hdl.handle.net/123456789/7101
Appears in Collections:Journal of Georgian Geophysical Society (2017)

Files in This Item:
File Description SizeFormat 
JGGS_20B_2017_1.pdfImpact of the Zonal Flows on the Relative Short-Scale ULF Electromagnetic Waves in the Shear Flow Driven Ionosphere358.36 kBAdobe PDFThumbnail
View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.