Artificial ionospheric turbulence (review)

Ерухимов, Л. М.; Metelev, S. A.; Myasnikov, E. N.; Mityakov, N. A.; Frolov, V. L.

doi:10.1007/bf01034489

Cited by 100 publications

(77 citation statements)

References 18 publications

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“…An O-polarized HF 31 pump wave effectively interacts with the background ionosphere plasma in the F2 layer in the 32 region between the HF reflection height and upper hybrid resonance altitude leading to the 33 excitation of thermal parametric (resonance) and parametric decay instabilities, which produce a 34 wide variety of phenomena (see, for example, Erukhimov et al, 1987;Robinson, 1989;Stubbe, 35 1996; Gurevich, 2007 and references therein). As for an X-mode HF pump wave, it does not 36 match the resonance altitudes and, therefore, should not excite the thermal parametric 37 (resonance) instability (TPI) as well as the parametric decay instability (PDI).…”

mentioning

confidence: 99%

Modification of the high latitude ionosphere F region by X-mode powerful HF radio waves: Experimental results from multi-instrument diagnostics

Blagoveshchenskaya

Борисова

Yeoman

et al. 2015

Journal of Atmospheric and Solar-Terrestrial Physics

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Abstract. We present experimental results concentrating on a variety of phenomena in 1 the high latitude ionosphere F2 layer induced by an extraordinary (X-mode) HF pump wave at 2 high heater frequencies (fH = 6.2 -8.0 MHz), depending on the pump frequency proximity to the 3 ordinary and extraordinary mode critical frequencies, foF2 and fxF2. The experiments were 4 carried out at the EISCAT HF heating facility with an effective radiated power of in October 2012 and October -November 2013. Their distinctive feature is a wide diapason of 6 critical frequency changes, when the fH /foF2 ratio was varied through a wide range from 0.9 to 7 1.35. It provides both a proper comparison of X-mode HF-induced phenomena excited under 8 different ratios of fH /foF2 and an estimation of the frequency range above foF2 in which such X-9 mode phenomena are still possible. It was shown that the HF-enhanced ion and plasma lines are 10 excited above foF2 when the HF pump frequency is lying in a range between the foF2 and fxF2, 11 foF2 ≤ fH ≤ fxF2, whereas small-scale field-aligned irregularities continued to be generated even 12 when fH exceeded fxF2 by up to 1 MHz and an X-polarized pump wave cannot be reflected from 13 the ionosphere. Another parameter of importance is the magnetic zenith effect (HF beam/radar 14 angle direction) which is typical for X-mode phenomena under fH /foF2 >1 as well as fH / foF2≤ 15 1. We have shown for the first time that an X-mode HF pump wave is able to generate strong 16 narrow band spectral components in the SEE spectra (within 1 kHz of pump frequency) in the 17 ionosphere F region, which were recorded far away from the HF heating facility. The observed 18 spectral lines can be associated with the ion acoustic, electrostatic ion cyclotron, and electrostatic 19 ion cyclotron harmonic waves (otherwise known as neutralized ion Bernstein waves). It is 20 suggested that these spectral components can be attributed to the stimulated Brillion scatter 21 (SBS) process. The comparison between the O-and X-mode narrow band spectra clearly 22 demonstrated that only an X-polarized pump wave scattered by SBS can propagate more than 23 one thousand km without significant deterioration. 24 25

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mentioning

confidence: 99%

Modification of the high latitude ionosphere F region by X-mode powerful HF radio waves: Experimental results from multi-instrument diagnostics

Blagoveshchenskaya

Борисова

Yeoman

et al. 2015

Journal of Atmospheric and Solar-Terrestrial Physics

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“…It is seen in the figures that the scattered signal was observed in the frequency band 14-18.5 MHz, whereas in the case of standard hop propagation through the F region of the ionosphere, the maximum observed frequency amounted to about 14 MHz. During the pause, the shifted signal was absent since its appearance is due to scattering of radio waves by artificial small-scale irregularities whose lifetimes do not exceed several tens of seconds under quiet ionospheric conditions [13]. Ionograms with the appearance of the scattered signal were observed from 17:00 to 20:00 UT in August 19 during the operation of the "Sura" facility.…”

Section: Experimental and Simulation Resultsmentioning

confidence: 98%

“…2c showing deviations of the cutoff frequency f 0F 2 , measured by the station at Khabarovsk in August 17-22, 2003, with respect to relatively quiet average values of f 0F 2 for August [11][12][13][14][15][16]2003 …”

Section: Experimental and Simulation Resultsmentioning

confidence: 99%

Radar observations of artificial ionospheric turbulence during a magnetic storm

Uryadov

Vertogradov²,

Vertogradov³

et al. 2004

Radiophys Quantum Electron

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We present the results of radar observations of artificial ionospheric turbulence (AIT) created due to modification of the ionosphere by high-power radio emission from the "Sura" heating facility (Nizhny Novgorod region, Russia). Measurements were carried out in August 18-22, 2003 in the evening time (16:00-20:00 UT) with the use of over-the-horizon chirp HF radars on the Khabarovsk-Rostov-on-Don, Irkutsk-Rostov-on-Don, Inskip (England)-Rostov-on-Don paths, and also on the Moscow-Rostov-on-Don path for which reference signals of the standard-time RVM station were received. It is found that conditions for propagation of HF signals through the upper ionosphere at frequencies exceeding the maximum usable frequency for standard hop propagation through the F region were realized on the Irkutsk-"Sura" path in the presence of the powerful sporadic E s layer. The presence of such signals was revealed at the Rostov-on-Don station by receiving radio waves which escape from the altitudes of the ionospheric F region due to scattering by artificial small-scale magnetic-field-aligned irregularities. We studied the ionospheric effects of a magnetic storm occurring during the experiment by using the measurement data of the Doppler frequency shift of signals scattered by artificial ionospheric turbulence. It is shown that during a magnetic storm, the electric field and the drift velocity of irregularities at the altitudes of the F layer over the "Sura" facility reach values of ∼ 8.6 mV/m and 186 m/s, respectively, which are typical of the high-latitude ionosphere. We consider the relation between quasi-periodic oscillations of the Doppler frequency shift of the scattered signal and propagation of magnetohydrodynamic waves excited during the magnetospheric storm.

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“…One of the most interesting phenomena which were discovered in the process of modification of the the Earth's ionosphere, by high-power radio waves is small-scale stratification of the ionospheric plasma into magnetic-field-aligned irregularities [1][2][3]. This phenomenon is accompanied by excitation of plasma waves and anomalous attenuation of the incident radiation.…”

Section: Formulation Of the Problem Of Laboratory Modelingmentioning

confidence: 99%

“…This happens for the critical value of the wave propagation angle ϕ = ϕ c determined by Eq. (2), which corresponds to the excitation of resonance cones by an electromagnetic source in the direction θ res determined by Eq. (3).…”

Section: Dispersion Properties Of Plasma Waves In a Magnetoplasmamentioning

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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Artificial ionospheric turbulence (review)

Cited by 100 publications

References 18 publications

Modification of the high latitude ionosphere F region by X-mode powerful HF radio waves: Experimental results from multi-instrument diagnostics

Modification of the high latitude ionosphere F region by X-mode powerful HF radio waves: Experimental results from multi-instrument diagnostics

Radar observations of artificial ionospheric turbulence during a magnetic storm

Laboratory modeling of nonlinear interaction of Langmuir waves with a magnetoplasma

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