Nonlinear Planetary Electromagnetic Vortex Structures in the Ionospheric F-Layer

Aburjaniya, G. D.; Khantadze, A. G.; Kharshiladze, O.

doi:10.1134/1.1494057

Cited by 3 publications

(11 citation statements)

References 5 publications

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“…Note that in contrast to the previous PEMW models (see Aburjania et al, 2002Aburjania et al, , 2003aAburjania and Chargazia, 2011;Aburjania et al, 2005;Kaladze et al, 2003) in this case the perturbed velocity U z is not equal to zero. By taking the z component of the first equation in Eqs.…”

Section: Yu Rapoport Et Al: Excitation Of Planetary Electromagneticmentioning

confidence: 65%

“…Herron (1966) has found that these waves can be captured into the ionospheric waveguide at the Alfvén speed minimum in the F region. Further development of these ideas brought the concept of vortex planetary electromagnetic waves (Kaladze et al, 2003;Khantadze, 1973;Aburjania et al, 2002Aburjania et al, , 2003aAburjania et al, , 2005Aburjania and Chargazia, 2011;Rapoport et al, 2011Rapoport et al, , 2012c. The developed theory of PEMW is supported by a number of observational results of planetary-scale electromagnetic perturbations (see e.g.…”

Section: Introduction and Formulation Of The Problemmentioning

confidence: 91%

“…The theoretical background of relevant experiments, therefore, includes (a) classification of various modes of hydromagnetic waves in the ionosphere (Aburjania et al, 2002(Aburjania et al, , 2003bAburjania and Chargazia, 2011); (b) estimations of wave parameters in linear theory (Aburjania et al, 2002(Aburjania et al, , 2003bRapoport et al, 2007;Aburjania and Chargazia, 2011); and (c) systematisation of estimates to prepare a measurement scheme (Aburjania et al, 2002(Aburjania et al, , 2003bAburjania and Chargazia, 2011). In particular, it has been found that the phase speed is of the order of 1 km s −1 to 10 3 km s −1 and even higher, depending on height, while the wavelength is of order 10 3 to 10 4 km.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, Eqs. (25)-(27) yield vortices, described by the Larichev-Reznik solution, including the Bessel function in the core and the McDonald function at the periphery of the nonlinear structure (Aburjania et al, 2002). The numerical simulation of the excitation of PEMW at the middle longitudes is out of scope of this paper.…”

Section: Nonlinear Equations For Pemw At Arbitrary Altitudes From D Tmentioning

confidence: 99%

“…We have shown that obtained equations can be reduced to the well-known system with Larichev-Reznik vortex solution in the equatorial region (see e.g. Aburjania et al, 2002). The excitation of planetary electromagnetic waves by different initial perturbations has been investigated numerically.…”

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confidence: 99%

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Excitation of planetary electromagnetic waves in the inhomogeneous ionosphere

et al. 2014

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Abstract. In this paper we develop a new method for the analysis of excitation and propagation of planetary electromagnetic waves (PEMW) in the ionosphere of the Earth. The nonlinear system of equations for PEMW, valid for any height, from D to F regions, including intermediate altitudes between D and E and between E and F regions, is derived. In particular, we have found the system of nonlinear one-fluid MHD equations in the β-plane approximation valid for the ionospheric F region (Aburjania et al., 2003a(Aburjania et al., , 2005. The series expansion in a "small" (relative to the local geomagnetic field) non-stationary magnetic field has been applied only at the last step of the derivation of the equations. The small mechanical vertical displacement of the media is taken into account. We have shown that obtained equations can be reduced to the well-known system with Larichev-Reznik vortex solution in the equatorial region (see e.g. Aburjania et al., 2002). The excitation of planetary electromagnetic waves by different initial perturbations has been investigated numerically. Some means for the PEMW detection and data processing are discussed.

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Section: Yu Rapoport Et Al: Excitation Of Planetary Electromagneticmentioning

confidence: 65%

Section: Introduction and Formulation Of The Problemmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Nonlinear Equations For Pemw At Arbitrary Altitudes From D Tmentioning

confidence: 99%

mentioning

confidence: 99%

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Excitation of planetary electromagnetic waves in the inhomogeneous ionosphere

et al. 2014

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Investigation of the strong turbulence in the geospace environment

Kharshiladze

Chargazia

2015

Adv. Radio Sci.

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Abstract. Plasma vortices are often detected by spacecraft in the geospace (atmosphere, ionosphere, magnetosphere) environment, for instance in the magnetosheath and in the magnetotail region. Large scale vortices may correspond to the injection scale of turbulence, so that understanding their origin is important for understanding the energy transfer processes in the geospace environment. In a recent work, turbulent state of plasma medium (especially, ionosphere) is overviewed. Experimental observation data from THEMIS mission (Keiling et al., 2009) is investigated and numerical simulations are carried out. By analyzing the THEMIS data for that event, we find that several vortices in the magnetotail are detected together with the main one and these vortices constitute a vortex chain. Such vortices can cause the strong turbulent state in the different media. The strong magnetic turbulence is investigated in the ionsophere as an ensemble of such strongly localized (weakly interacting) vortices. Characteristics of power spectral densities are estimated for the observed and analytical stationary dipole structures. These characteristics give good description of the vortex structures.

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Self-organization of ULF electromagnetic wave structures in the shear flow driven dissipative ionosphere

Aburjania

Chargazia

Kharshiladze

et al. 2014

Preprint

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Abstract. 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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Nonlinear Planetary Electromagnetic Vortex Structures in the Ionospheric F-Layer

Cited by 3 publications

References 5 publications

Excitation of planetary electromagnetic waves in the inhomogeneous ionosphere

Excitation of planetary electromagnetic waves in the inhomogeneous ionosphere

Investigation of the strong turbulence in the geospace environment

Self-organization of ULF electromagnetic wave structures in the shear flow driven dissipative ionosphere

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