Fractal dynamics of electric discharges in a thundercloud

Иудин, Д. И.; Trakhtengerts, V. Yu.; Hayakawa, Masashi

doi:10.1103/physreve.68.016601

Cited by 37 publications

(46 citation statements)

References 8 publications

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“…This inequality corresponds to exceeding the threshold of the beam instability and in accordance with the estimates presented in [13][14][15][16] can be fulfilled in a thunderstorm cloud. It is important that this instability is not saturated by an increase in the air conductivity and potential energy of the electric field can be comparable with the kinetic energy of the lifting air flow.…”

Section: Mechanism Of Rapid Increase Of the Electric Field At The Stasupporting

confidence: 81%

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Current Problems of Electrodynamics of a Thunderstorm Cloud

Trakhtengerts

Иудин

2005

Radiophys Quantum Electron

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Electrodynamics of a thunderstorm cloud is considered with allowance for recirculation and multiflow motion of charged intracloud particles. In this simulation, the large-scale electric-field emerges due to the charge separation at the process of air convection and develops through the oscillation regime in the initial and final stages of the thunderstorm evolution. These oscillations qualitatively explain the observed behavior of the electric field of a thunderstorm. On the other hand, the multiflow convection is unstable and leads to generation of small-scale electrostatic waves (wavelength from 1 to 100 m) with amplitude reaching the conventional breakdown value. Such an instability can initiate microdischarge intracloud activity at the preliminary stage of the lightning discharge and between individual return strokes. We propose a three-dimensional cellular automata model which describes the main features of the preliminary stage of the lightning.

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Section: Mechanism Of Rapid Increase Of the Electric Field At The Stasupporting

confidence: 81%

“…The studies [13][14][15][16] show that small-scale electric cells can be excited in a thunderstorm cloud at its mature stage if the inequality…”

Section: Mechanism Of Rapid Increase Of the Electric Field At The Stamentioning

confidence: 99%

Current Problems of Electrodynamics of a Thunderstorm Cloud

Trakhtengerts

Иудин

2005

Radiophys Quantum Electron

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“…The realistic causative strokes must be horizontally asymmetric, and in the simplest case their channel contains only the vertical and a horizontal part. We do not consider the preliminary process in the stroke and suggest that the complicated form often splits and even 'fractal' channels (Riousset et al 2007;Iudin et al 2003;Hayakawa et al 2008) are simply the horizontal and vertical straight lines. Such a simplification is justified by the intention to single out the role of channel geometry.…”

Section: Discussionmentioning

confidence: 98%

Transient Electric Field in the Mesosphere above a Γ-shape Lightning Stroke

Kudintseva

Nickolaenko²,

Hayakawa

2010

Surv Geophys

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We describe the space-time distribution of the pulsed electric field in the middle atmosphere above a positive C-shaped lightning stroke. The channel of such a discharge contains a vertical and a horizontal section. The current wave moves initially vertically and then turns horizontally so that radiation appears from the vertical electric dipole followed by that from the horizontal dipole. Combined with reflection from the perfectly conducting ground, the source provides three subsequent pulses in the atmosphere, with the lag being determined by the finite velocity of the current wave in the C-shaped stroke. The pulses are reproduced by reflections from the air-ground and the airionosphere interfaces and the waveform resembles the M-component, which is often noted in the negative strokes (e.g. Yashunin et al., J Geophys Res 112:D10109, 2007). The nonstationary fine structure appears in the spatial distribution of electric field, which persists for 2 ms or even more and exceeds the runaway electron threshold. Estimates support the idea of free electron bunching in the mesosphere by the pulsed electric field. Focusing may occur about 10 km away from the point of electron-field interaction; it is delayed by a few ms from the moment of interaction. The data presented might be helpful in realistic modeling of the red sprite formation.

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“…The breakdown field at the altitude 5-10 km has the value of the order of E k ¼ 10 5 Vm 71 . According to the observation of lightning discharges, the velocity of discharge wave has the value of the order of u ¼ 10 7 710 8 ms 71 (Betz et al, 2009), and the occurrence frequency of discharges has the value v ¼ 2 6 10 5 s 71 (Iudin and Trakhtengerts 2001). Taking into account l ¼ 10 m, u ¼ 10 8 ms 71 , t ¼ 10 77 s, one finds I 0 ¼ 50 A.…”

Section: Very High-frequency Radio Emissionmentioning

confidence: 99%

“…We use the model of distribution of linear current in the discharge, which was presented by Iudin and Trakhtengerts (2001). The corresponding formula has the form…”

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confidence: 99%

Model of electric discharge formation in the lower atmosphere over a seismic region

Сорокин

Ruzhin

Кузнецов

et al. 2012

Geomatics, Natural Hazards and Risk

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The altitude distribution of seismic-related direct current (DC) electric field in the Earth-ionosphere layer is computed. This field is generated by the conductivity current flowing in closed atmosphere-ionosphere electric circuit at the preparatory stage of an earthquake. The source of the current is electromotive force caused by upward convective transport and gravitational sedimentation of charged aerosols injected into the atmosphere by soil gases in the course of intensification of seismic processes. It is shown from the solution of a selfconsistent set of non-linear equations that pre-earthquake DC electric field enhancement in the atmosphere can reach breakdown value at the altitudes 1-10 km and initiate numerous chaotic electrical discharges in this region. The generation theory of very high-frequency electromagnetic radiation by such discharges is developed. The calculated spectrum and other characteristics of the radiation are in a good agreement with experimental data on radio emission at the frequencies of *41 and *53 MHz that have been observed on several stations of Crete Island in connection with impending earthquakes.

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Fractal dynamics of electric discharges in a thundercloud

Cited by 37 publications

References 8 publications

Current Problems of Electrodynamics of a Thunderstorm Cloud

Current Problems of Electrodynamics of a Thunderstorm Cloud

Transient Electric Field in the Mesosphere above a Γ-shape Lightning Stroke

Model of electric discharge formation in the lower atmosphere over a seismic region

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