Nonlinear trapping and self-guiding of magnetized Langmuir waves due to thermal plasma filamentation

Назаров, В. Е.; Starodubtsev, M.; Костров, А. В.

doi:10.1063/1.2822161

Cited by 11 publications

(10 citation statements)

References 28 publications

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“…The maximum is directed along the external magnetic field. In Starodubtsev et al [] and Nazarov et al [], it was shown that the formation of this radiation component is connected with the thermal self‐channeling of Langmuir waves and could be described as follows. Langmuir waves are trapped inside a small‐scale plasma fluctuation, where they get absorbed.…”

Section: Experimental Studies Of Thermal Self‐channeling Of Magnetizementioning

confidence: 99%

Laboratory modeling of ionospheric heating experiments

et al. 2016

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Turbulent plasma processes, such as those which occur in the Earth's ionosphere during ionospheric heating by powerful radio waves, were studied under laboratory conditions, and new physical models of small‐scale ionospheric turbulence are proposed as a result of these studies. It is shown here that the mechanism of small‐scale plasma filamentation can be connected with the thermal self‐channeling of Langmuir waves. During this process, Langmuir waves are guided by a plasma channel, which in turn is formed by the guided waves through a thermal plasma nonlinearity. The spectrum of the self‐guided Langmuir waves exhibits sidebands whose features are similar to stimulated electromagnetic emission. We present two mechanisms of sideband generation. The first mechanism can be observed during the formation of the plasma channel and is connected with the parametric shift in the frequency of the self‐channeling wave. The second mechanism is connected with the scattering of the self‐channeling wave on the low‐frequency eigenmodes of the plasma irregularity.

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Section: Experimental Studies Of Thermal Self‐channeling Of Magnetizementioning

confidence: 99%

Laboratory modeling of ionospheric heating experiments

et al. 2016

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“…In [13,14], it was found that the most effective mechanism leading to the formation of a field-aligned plasma irregularity is the thermal self-channeling of Langmuir waves in a magnetoplasma. The mechanism of the thermal self-channeling of Langmuir waves is as follows.…”

Section: Dispersion Characteristics Of Langmuir Waves In a Magnetoplasmamentioning

confidence: 99%

“…4c and 4d). In [13,14], it is shown that the formation of this component is related to the thermal self-channeling of Langmuir waves in a magnetoplasma. Note the main features of this process.…”

Section: Experimental Study Of the Thermal Self-chaneling Of Langmuirmentioning

confidence: 99%

“…The excitation of plasma waves, in turn, is related to scattering of the incident radio wave from the seed small-scale irregularities of the ionospheric plasma. The laboratory experiments performed by the authors of this paper [13,14], which model the formation of small-scale irregularities under the action of thermal instability of a magnetoplasma in the field of short-wavelength plasma oscillations, show that the thermal instability of the magnetoplasma in the vicinity of the plasma resonance, which is related to self-channeling of the Langmuir waves, has the lowest threshold. Such a selfchanneling results in the formation of a narrow magnetic-field-aligned irregularity with decreased plasma density.…”

Section: Introductionmentioning

confidence: 95%

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Laboratory studies of spectral features of stimulated electromagnetic emission during the ionospheric heating experiments

Starodubtsev

Назаров

Костров

2009

Radiophys Quantum El

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533.9We present the results of laboratory studies of the formation of a number of spectral components of stimulated electromagnetic emission, which are related to the excitation of small-scale irregularities in the heated ionosphere. In the laboratory experiment, the small-scale irregularity was formed as a result of thermal self-channeling of short-wavelength quasielectrostatic oscillations in a magnetoplasma. Using the method of probing waves, it is experimentally shown that the trapping and waveguide propagation in a small-scale plasma irregularity are exclusively due to Langmuir waves, whereas the upper-hybrid waves with anomalous dispersion are not trapped into the irregularity. It is found that satellites shifted by about 1-2 MHz from the carrier frequency (700 MHz under the experimental conditions) are formed in the Langmuir wave spectrum during the thermal self-channeling. Two mechanisms of generation of spectral satellites have been detected. The first (dynamic) mechanism is observed during the formation of a small-scale irregularity with rapidly increasing longitudinal size. In this case, one low-frequency satellite is excited in the trapped-wave spectrum. The mechanism of the formation of this satellite is apparently related to the Doppler shift of the frequency of the Langmuir waves trapped inside the irregularity. The second (stationary) mechanism is observed in the case of a developed irregularity where its shape is close to cylindrical. In this regime, the trapped-wave spectrum has two symmetric spectral satellites, namely, high-and low-frequency ones. It may be hypothesized that the generation of these satellites is due to scattering of trapped Langmuir waves from drift oscillations of the irregularity.

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“…This paper reviews the results of laboratory experiments [10,11] which modeled the formation of small-scale irregularities as a result of thermal instability of a magnetoplasma in the field of short-wavelength plasma oscillations. It is shown that the thermal instability of a magnetoplasma in the vicinity of the plasma resonance, which is related to the self-channeling of Langmuir waves, has the lowest threshold.…”

Section: Formulation Of the Problem Of Laboratory Modelingmentioning

confidence: 99%

Laboratory modeling of nonlinear interaction of Langmuir waves with a magnetoplasma

Костров

Назаров

Starodubtsev

2008

Radiophys Quantum El

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UDC 533.9We present the results of laboratory modeling of the physical processes which lead to smallscale stratification of the ionospheric plasma during active experiments on modification of the ionosphere by high-power radio waves. It is shown that such a stratification can result from thermal self-channeling of Langmuir waves in a magnetoplasma. We established that the selfchanneling is threshold in behavior such that the threshold significantly increases near gyroharmonics. It is demonstrated that in the process of self-channeling, the frequency spectrum of the Langmuir wave is enriched. In particular, spectral maxima are formed, which are shifted away from the carrier frequency by a value of the order of the lower-hybrid frequency.

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Nonlinear trapping and self-guiding of magnetized Langmuir waves due to thermal plasma filamentation

Cited by 11 publications

References 28 publications

Laboratory modeling of ionospheric heating experiments

Laboratory modeling of ionospheric heating experiments

Laboratory studies of spectral features of stimulated electromagnetic emission during the ionospheric heating experiments

Laboratory modeling of nonlinear interaction of Langmuir waves with a magnetoplasma

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