Self-organization of planetary electromagnetic waves in the E-region of the ionosphere

Abstract.Using an analogy method the frequencies of new modes of the electromagnetic planetary-scale waves (with a wavelength of 10 3 km or more), having a weather forming nature, are found at different ionospheric altitudes. This method gives the possibility to determine spectra of ionospheric electromagnetic perturbations directly from the dynamic equations without solving the general dispersion equation. It is shown that the permanently acting factor-latitude variation of the geomagnetic field generates fast and slow weakly damping planetary electromagnetic waves in both the E-and F-layers of the ionosphere. The waves propagate eastward and westward along the parallels. The fast waves have phase velocities (1-5) km s −1 and frequencies (10 −1 -10 −4 ), and the slow waves propagate with velocities of the local winds with frequencies (10 −4 -10 −6 ) s −1 and are generated in the E-region of the ionosphere. Fast waves having phase velocities (10-1500) km s −1 and frequencies (1-10 −3 ) s −1 are generated in the F-region of the ionosphere. The waves generate the geomagnetic pulsations of the order of one hundred nanoTesla by magnitude. The properties and parameters of the theoretically studied electromagnetic waves agree with those of large-scale ultra-low frequency perturbations observed experimentally in the ionosphere.

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“…Taking into account both components of the geomagnetic field, we obtain (Khantadze, 1989;Aburjania et al, 2001):…”

Section: Large-scale Wavy Perturbationsmentioning

confidence: 99%

On the new modes of planetary-scale electromagnetic waves in the ionosphere

et al. 2004

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“…Therefore, the above-mentioned expressions for planetary waves are only approximate formulae. An attempt to fill this gap was made in the papers (Aburjania et al, 2003(Aburjania et al, , 2005Aburjania and Khantadze, 2005;Khantadze et al, 2006).…”

Section: Planetary Electromagnetic Waves In the Ionospheric E-and F-rmentioning

confidence: 99%

Electromagnetic oscillations of the Earth's upper atmosphere (review)

et al. 2010

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Abstract.A complete theory of low-frequency MHD oscillations of the Earth's weakly ionized ionosphere is formulated. Peculiarities of excitation and propagation of electromagnetic acoustic-gravity, MHD and planetary waves are considered in the Earth's ionosphere. The general dispersion equation is derived for the magneto-acoustic, magnetogravity and electromagnetic planetary waves in the ionospheric E-and F-regions. The action of the geomagnetic field on the propagation of acoustic-gravity waves is elucidated. The nature of the existence of the comparatively new largescale electromagnetic planetary branches is emphasized.

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“…These waves in [8,9] were called magnetogradient waves of Khantadze. In the above-stated papers [2][3][4][5][6][7] classification of magnetogradient planetary waves (fast and slow), hydrodynamic end electromagnetic nature of these waves and the anisotropic nature of their propagation caused by curvature of lines of force of the geomagnetic field along the Earth parallels was for the first time given. Assessment of parameters of the considered waves, and also linear and nonlinear theories of magnetogradient waves, is given in [10][11][12][13][14]. Experimentally these waves were recorded in [8,15,16].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Magnetogradient Waves in the Upper Atmosphere

Jandieri

Gvelesiani

Diasamidze

et al. 2017

JAP

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I S S N 2347-3487 V o l u m e 1 3 N u m b e r 5 J o u r n a l o f A d v a n c e s i n P h y s i c s | THREE-DIMENSIONAL MAGNETOGRADIENT WAVES IN THE UPPER ATMOSPHERE ABSTRACTGeneral dispersion equation has been obtained for three-dimensional electromagnetic planetary waves, from which follows, as particular case Khantadze results in one-dimension case. It was shown that partial magnetic field line freezingin as in one-dimension case lead to the excitation of both "fast" and "slow" planetary waves, in two-liquid approximation (i.e. at ion drag by neutral particles) they are represent oscillations of magnetized electrons and partially magnetized ions in E region of the ionosphere. In F region of the ionosphere using one-liquid approximation only "fast" planetary wave will be generated representing oscillation of medium as a whole. Hence, it was shown that three-dimension magnetogradient planetary waves are exist in all components of the ionosphere, and as exact solutions, with well-known slow short-wave MHD waves, are simple mathematical consequence of the MHD equations for the ionosphere.

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Self-organization of planetary electromagnetic waves in the E-region of the ionosphere

Cited by 20 publications

References 20 publications

On the new modes of planetary-scale electromagnetic waves in the ionosphere

On the new modes of planetary-scale electromagnetic waves in the ionosphere

Electromagnetic oscillations of the Earth's upper atmosphere (review)

Three-Dimensional Magnetogradient Waves in the Upper Atmosphere

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