Study of large-scale irregularities generated in the ionosphericF-region by high-power HF waves

Frolov, V. L.; Chugurin, V. V.; Комраков, Г. П.; Mityakov, N. A.; Myasnikov, E. N.; Rapoport, V. O.; Сергеев, Е. Н.; Uryadov, V. P.; Vybornov, F. I.; Иванов, В. А.; Shumaev, V. V.; Nasyrov, A. M.; Nasyrov, I. A.; Groves, K. M.

doi:10.1007/bf02677173

Cited by 11 publications

(12 citation statements)

References 47 publications

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“…In turn, the development of upper-hybrid turbulence as a result of thermal parametric effects enhances significantly the large-scale structures. For example, it was found in the experiments [99,100] that strong large-scale inhomogeneities arise when f 2 0 < f 2 cF 2 + f 2 ce , i.e., when the PW frequency turns out to be lower than the upper-hybrid one in the maximum of the F 2 layer, and that an upper-hybrid resonance region where f 2 0 = f 2 pe + f 2 ce (f pe is the plasma frequency) exists for the PW in the ionosphere. In this case, the reflection of the PW from the ionosphere can be absent (f 0 > f cF 2 ).…”

Section: Large-scale Stratification Of the Ionospheric Plasmamentioning

confidence: 86%

The “Sura” facility: Study of the atmosphere and space (a review)

Belikovich¹,

Грач

Karashtin³

et al. 2007

Radiophys Quantum El

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Section: Large-scale Stratification Of the Ionospheric Plasmamentioning

confidence: 86%

The “Sura” facility: Study of the atmosphere and space (a review)

Belikovich¹,

Грач

Karashtin³

et al. 2007

Radiophys Quantum El

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“…Such experiments are most easy at sunrise or at sunset when the critical frequency is gradually varied in a natural way. According to [12,29] and many other measurements, the DM component appears even in the case where f PW exceeds the critical frequency of the ionospheric F 2 layer by 100−200 kHz. This, in particular, gave grounds to state [5] that the DM is generated near the level of the upper-hybrid resonance for the O-mode pumping wave, which is usually located several kilometers below the height of reflection of this wave in the ionosphere.…”

Section: Main Characteristics Of Nc Thmentioning

confidence: 95%

Properties of the thermal narrow-continuum component in the spectrum of stimulated ionospheric emission

Frolov

Nedzvetsky

Сергеев

et al. 2005

Radiophys Quantum Electron

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We present the results of experimental studies of the properties of the thermal narrow-continuum component NC th of stimulated electromagnetic emission (SEE) of the ionosphere observed in a narrow region between the pump frequency and the downshifted maximum (DM). Spectral and dynamic characteristics of the NC th component are considered and the dependence of its properties on the frequency and power of the pumping wave as well as on the zenith angle of a high-power radio-wave beam in the geomagnetic-meridian plane is analyzed. It is proved that the NC th generation is determined by the thermal (resonant) parametric instability near the level of the upper-hybrid resonance for a high-power radio wave. New experimental data on the properties of the main DM thermal component in the spectrum of stimulated electromagnetic emission, which we used as the reference component in most measurements, are presented.

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“…The PW frequency was varied near the fourth or fifth harmonics of the electron gyrofrequency, and the generation of middle-scale inhomogeneities was controlled by the appearance of artificial F -spread on ionograms or the occurrence of fluctuations of the test-wave signal reflected from the ionosphere during sounding of the perturbed ionospheric region. First results of such measurements near the frequency 4f ce are presented in [11]. They show that F -spread has gyroharmonic properties, from where it follows unambiguously that the high-frequency plasma turbulence excited by a high-power O-mode radio wave must also participate in the generation of middle-scale turbulence.…”

Section: Introductionmentioning

confidence: 95%

Gyroharmonic properties of the middle-scale artificial ionospheric turbulence during heating of the ionospheric F 2 layer by a high-power O-mode radio wave

Frolov

Nedzvetsky

Uryadov

et al. 2008

Radiophys Quantum El

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We present the results of studying the properties of artificial F -spread that appears on ionograms during heating of the ionospheric F 2 region by a high-power O-mode radio wave. It is shown that the regions of resonant interaction of a high-power radio wave with plasma, where the pump-wave energy is almost totally absorbed and the plasma is subject to intense heating, affect significantly the development of a self-focusing instability of a high-power radio wave and the generation of middle-scale (with characteristic scales across the magnetic field l ⊥ ≈ 0.4−1.5 km) artifical ionospheric inhomogeneities. It is established that the intensity of such inhomogeneities depends on the sign and magnitude of detuning of the pump-wave frequency with respect to the electron gyroresonance harmonic frequency ∆f = f PW − nf ce and has the minimum value for ∆f ≈ −20 kHz, thus demonstrating the asymmetry of the gyroharmonic properties of their excitation mechanism. Relationship between the observed phenomena and known characteristics of the artificial ionospheric turbulence for f PW ≈ nf ce is analyzed.

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Study of large-scale irregularities generated in the ionosphericF-region by high-power HF waves

Cited by 11 publications

References 47 publications

The “Sura” facility: Study of the atmosphere and space (a review)

The “Sura” facility: Study of the atmosphere and space (a review)

Properties of the thermal narrow-continuum component in the spectrum of stimulated ionospheric emission

Gyroharmonic properties of the middle-scale artificial ionospheric turbulence during heating of the ionospheric F 2 layer by a high-power O-mode radio wave

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