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| Titel |
Self-organization of ULF electromagnetic wave structures in the shear flow driven dissipative ionosphere |
| VerfasserIn |
G. Aburjania, K. Chargazia, O. Kharshiladze, G. Zimbardo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2198-5634
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics Discussions ; 1, no. 2 ; Nr. 1, no. 2 (2014-08-26), S.1431-1464 |
| Datensatznummer |
250115123
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| Publikation (Nr.) |
 copernicus.org/npgd-1-1431-2014.pdf |
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| Zusammenfassung |
| This work is devoted to investigation of nonlinear dynamics of
planetary electromagnetic (EM) ultra-low-frequency wave (ULFW)
structures in the rotating dissipative ionosphere in the presence of
inhomogeneous zonal wind (shear flow). Planetary EM ULFW appears as
a result of interaction of the ionospheric medium with the spatially
inhomogeneous geomagnetic field. The shear flow driven wave
perturbations effectively extract energy of the shear flow
increasing own amplitude and energy. These perturbations undergo
self organization in the form of the nonlinear solitary vortex
structures due to nonlinear twisting of the perturbation's
front. Depending on the features of the velocity profiles of the
shear flows the nonlinear vortex structures can be either monopole
vortices, or dipole vortex, or vortex streets and vortex
chains. From analytical calculation and plots we note that the
formation of stationary nonlinear vortex structure requires some
threshold value of translation velocity for both non-dissipation and
dissipation complex ionospheric plasma. The space and time
attenuation specification of the vortices is studied. The
characteristic time of vortex longevity in dissipative ionosphere is
estimated. The long-lived vortices transfer the trapped medium
particles, energy and heat. Thus they represent structural elements
of turbulence in the ionosphere. |
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