Excitation of the ionospheric resonance cavity by neutral winds at middle latitudes

Сурков, В. В.; Pokhotelov, O. A.; Parrot, M.; Fedorov, E. N.; Hayakawa, Masashi

doi:10.5194/angeo-22-2877-2004

Cited by 41 publications

(50 citation statements)

References 23 publications

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“…As a possible source of the IAR excitation, the generation of the ionospheric turbulence and currents by the neutral wind in the lower ionosphere has been suggested (Surkov et al, 2004). These authors showed theoretically that a part of the neutral gas kinetic energy can be transferred into the energy of the electric current in the conductive ionosphere, which is then converted into the energy of Alfven and fast compressional MHD modes.…”

Section: Introductionmentioning

confidence: 99%

ULF impulsive magnetic response at mid-latitudes to lightning activity

et al. 2011

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Induction magnetometer data from the mid-latitude station Moshiri (geomagnetic latitude 35.6• ) has been examined in search of a transient ULF response to the regional lightning activity. For many events, besides the main impulse produced by the lightning discharge, a secondary impulse delayed about 1 sec was observed. These secondary echo-impulses are probably caused by the partial re ection of wave energy of the initial lightning pulse from the upper boundary of the ionospheric Alfven resonator in the topside ionosphere. The modeling with arti cial signals has shown that a multi-band spectral resonant structure (SRS) can be formed owing to the occurrence of paired pulses in analyzed time series. The statistical superposed epoch method indeed has revealed a dominance of two-pulse structure in the magnetic eld background during the periods of the SRS occurrence.

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Section: Introductionmentioning

confidence: 99%

ULF impulsive magnetic response at mid-latitudes to lightning activity

et al. 2011

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“…In order to find the electromagnetic perturbations in the atmosphere, we apply a Fourier transform to Equation (5). The results are given by b A − k 2 b A = 0 and e A − k 2 e A = 0.…”

Section: Basic Equationsmentioning

confidence: 99%

“…Similar mechanisms, i.e., the generation of GMPs, can be responsible for naturally occurring co-seismic electromagnetic effects associated with seismic wave propagation in solid geological media having conductivity, for example, in porous watersaturated rocks [3]. At the ionospheric D-and E-layer altitudes, the neutral winds and acoustic gravity waves give rise to entrainment of the ionospheric plasma particles with neutral molecules thereby exciting ionospheric currents and GMPs [4,5].…”

Section: Introductionmentioning

confidence: 99%

Perturbations of Ambient Magnetic Field Resulted From a Ball Motion in a Conductive Liquid Half-Space

Сурков¹,

Сорокин²,

Yashchenko³

2018

PIER B

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Abstract-We theoretically analyze perturbations of ambient magnetic field due to electric currents caused by motion of a dielectric ball in a conductive fluid half-space. The approximate analytical solution of the problem has been derived for the case of arbitrary orientation of the ambient magnetic field and under the requirement that the fluid flow around the ball is laminar and potential in character. We examine spatiotemporal distribution of these perturbations and their dependence on both the depth and distance from the moving ball. Amplitudes of electromagnetic perturbations generated by the fluid flow around the ball have been compared with that resulting from gravity waves in the fluid.

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“…The possibility of the IAR excitation by the fluctuations of neutral gas velocity at the heights of the ionospheric E-layer was theoretically predicted by Molchanov et al (2004), and Surkov et al (2004). Fluctuations of the neutral particle velocity result in the alternating ionospheric current, which radiates MHD waves into the upper ionosphere.…”

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confidence: 99%

Modeling diurnal variations of the IAR parameters

et al. 2016

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Characteristic feature of the upper ionosphere is the occurrence of the ionospheric Alfvén resonator (IAR) and MHD waveguide, which can trap the electromagnetic waves in the frequency range from fractions of Hz to few Hz. The proposed numerical model is based on the solution of MHD equations in a realistic ionosphere, whose parameters are reconstructed from the IRI model. We estimated, both analytically and numerically, a critical, wave scale dependent, value of the Hall conductance when a wave equation for an uncoupled Alfvénic mode can be used to estimate the spectral parameters of the IAR. The model has enabled us to compare the contributions into the IAR Q-factor of the Joule dissipation in the lower ionosphere and a wave leakage into the magnetosphere. The first mechanism dominates during daytime, whereas the latter mechanism prevails during nighttime. The ground signatures of IAR can be used for monitoring of the F-layer plasma density and vertical total electron content on the basis of relationships derived from the developed IAR model.

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Excitation of the ionospheric resonance cavity by neutral winds at middle latitudes

Cited by 41 publications

References 23 publications

ULF impulsive magnetic response at mid-latitudes to lightning activity

ULF impulsive magnetic response at mid-latitudes to lightning activity

Perturbations of Ambient Magnetic Field Resulted From a Ball Motion in a Conductive Liquid Half-Space

Modeling diurnal variations of the IAR parameters

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