Investigation by backscatter radar of artificial irregularities produced in ionospheric plasma heating experiments

Бахметьева, Н. В.; Bubukina, V. N.; Ignat’ev, Yu. A.; Bochkarev, G. S.; Еременко, В. А.; Koltsov, V. V.; Krasheninnikov, I. V.; Cherkashin, Yu. N.

doi:10.1016/s1364-6826(96)00120-4

Cited by 15 publications

(8 citation statements)

References 12 publications

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“…Experimental value of the power-law spectrum of the ionosphere (< p >≈ 4) , measured by translucence of satellite signals [16], is within the limits of p. Experimental observations of backscattering signals from the artificially disturbed region of the ionosphere by the powerful HF radio emission shows that a lot of artificial ionospheric irregularities of the electron density are stretched along the geomagnetic field. Power-law spectral index was within the limits p = 1.4 ÷ 4.8 for different heating sessions using "Sura" heating facility in the frequency range of 4.7÷9 MHz (ordinary mode) with the effective radiated power 50 ÷ 70 MW beamed vertically upwards [17].…”

Section: Anisotropic Gaussian and Power-law Correlation Functionsmentioning

confidence: 76%

Model Computations of Angular Power Spectra for Anisotropic Absorptive Turbulent Magnetized Plasma

Jandieri¹,

Ishimaru²,

Jandieri³

et al. 2007

PIER

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Abstract-Electromagnetic waves scattering in turbulent anisotropic collision magnetized ionospheric plasma is investigated using complex geometrical optics approximation.Correlation function of the phase fluctuations of scattered radiation is obtained taking into account both electron density and magnetic fields fluctuations. The features of the angular power spectrum of scattered radiation are investigated analytically and numerically. The expressions of broadening of the spatial spectrum have been obtained for both powerlaw and anisotropic Gaussian correlation functions of electron density fluctuations. Gaussian spectral function takes into account the axial ratio of the field-aligned irregularities and the angle of inclination of prolate irregularities with respect to the external magnetic field. The variance of the phase and scintillation level of scattered radiation are calculated numerically for F -region irregularities of the ionosphere. The conditions of non-fully and fully developed diffraction patterns have been determined.

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Section: Anisotropic Gaussian and Power-law Correlation Functionsmentioning

confidence: 76%

Model Computations of Angular Power Spectra for Anisotropic Absorptive Turbulent Magnetized Plasma

Jandieri¹,

Ishimaru²,

Jandieri³

et al. 2007

PIER

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“…[2] Generation of artificial field-aligned irregularities of electron density due to the ionospheric heating by powerful radio waves of O-mode was first discovered at Platteville [Thome and Blood, 1974;Fialer, 1974]. Later this effect was confirmed by experiments conducted at other HFheating facilities [Hansen et al, 1992;Kelley et al, 1995;Bakhmet'eva et al, 1997;Dhillon and Robinson, 2005]. It was found that the wavelength spectrum of the artificial irregularities was in the range from tens of meters to kilometers.…”

Section: Introductionmentioning

confidence: 99%

Perturbations of GPS signals by the ionospheric irregularities generated due to HF‐heating at triple of electron gyrofrequency

Milikh

Gurevich

Zybin

et al. 2008

Geophysical Research Letters

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The objective of this letter is to present the first experimental evidence of perturbations of GPS signals by the electron density irregularities caused by the HF‐heating of the F2 region of the ionosphere. The experiments were conducted using the HAARP heater having the radiating frequency f which matches 3 fB, i.e., triple the local electron gyro frequency. Such frequency is expected to generate super small irregularities of the electron density which can scatter GPS signals. It was found that the differential phase of the probe GPS signals changed abruptly in about 10 s after the start of the HF‐heating, and then oscillated with the heating period 20 s. The oscillations lasted for 4–5 minutes and then disappeared, presumably when the resonance condition f = 3 fB was not satisfied, although the HF‐heating continued. The phase oscillations indicate the presence of small scale irregularities of the electron density caused by the HF‐heating at the frequency matching 3 fB.

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“…Experimental value of the power-law spectrum of the ionosphere ( p ≈ 4), measured by translucence of satellite signals [20], is within the limits of p. Experimental observations of backscattering signals from the artificially disturbed region of the ionosphere by the powerful HF radio emission shows that a lot of artificial ionospheric irregularities of the electron density are stretched along the geomagnetic field. Powerlaw spectral index was within the limits p = 1.4 ÷ 4.8 for different heating sessions using "Sura" heating facility in the frequency range of 4.7 ÷ 9 MHz (ordinary mode) with the effective radiated power 50 ÷ 70 mW beamed vertically upwards [21]. Correlation function describing fluctuations of an external magnetic field has anisotropic Gaussian form [14]: The analysis shows that in this case the amplitude and phase fluctuations of the field components of the ordinary wave are less than those of the extraordinary wave.…”

Section: Numerical Results and Discussionmentioning

confidence: 80%

Some Peculiarities of the Spatial Power Spectrum of Scattered Electromagnetic Waves in Randomly Inhomogeneous Magnetized Plasma With Electron Density and External Magnetic Field Fluctuations

Jandieri¹,

Ishimaru²

2013

PIER B

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Abstract-Statistical characteristics of multiply scattered electromagnetic waves in turbulent magnetized plasma with both electron density and external magnetic field fluctuations are considered. Analytical expression for phase fluctuations of scattered radiation is derived using the smooth perturbation method. Correlation and wave structure functions of the phase fluctuations, angle-of-arrivals are obtained for arbitrary correlation functions of fluctuating plasma parameters and external magnetic field taking into account the diffraction effects. The evolution of a double-peaked shape in the spatial power spectrum of scattered radiation is analyzed numerically for both anisotropic Gaussian and power-law spectra of electron density fluctuations using experimental data. Phase portraits of external magnetic field fluctuations have been constructed for different non-dimensional spatial parameters characterizing a given problem.

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Investigation by backscatter radar of artificial irregularities produced in ionospheric plasma heating experiments

Cited by 15 publications

References 12 publications

Model Computations of Angular Power Spectra for Anisotropic Absorptive Turbulent Magnetized Plasma

Model Computations of Angular Power Spectra for Anisotropic Absorptive Turbulent Magnetized Plasma

Perturbations of GPS signals by the ionospheric irregularities generated due to HF‐heating at triple of electron gyrofrequency

Some Peculiarities of the Spatial Power Spectrum of Scattered Electromagnetic Waves in Randomly Inhomogeneous Magnetized Plasma With Electron Density and External Magnetic Field Fluctuations

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