Untitled

Myasnikov, E. N.; Muravjeva, N. V.; Сергеев, Е. Н.; Frolov, V. L.; Nasyrov, A. M.; Nasyrov, I. A.; Beley, V. S.; Koloskov, A. V.; Yampolsky, Yu.; Groves, K. M.

doi:10.1023/a:1014257628617

Cited by 13 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For f PW ≈ nf ce , the quantity δN amounts to 4−5%, and for ∆f ≈ −20 kHz we obtain δN ∼ 1.5−3%. The found values δN ≈ 3−4% outside the gyroharmonic resonance regions are in agreement with the measurement results [4,5,24,25] that yield the values δN ≈ 1−6%.…”

Section: Discussion Of Resultssupporting

confidence: 91%

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Discussion Of Resultssupporting

confidence: 91%

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…Djuth et al, 2005). Such structures were also obtained by different radio methods and in-situ measurements (Basu et al, 1997;Kelley et al, 1995;Frolov et al, 2001;Myasnikov et al, 2001;Djuth et al, 2006). The existence of such structures is supported by theoretical predictions (e.g.…”

Section: Introductionmentioning

confidence: 60%

On the location and structure of the artificial 630-nm airglow patch over Sura facility

et al. 2007

Self Cite

View full text Add to dashboard Cite

Abstract.Results are presented of the artificial optical emission of the atomic oxygen red line (the radiation of level O( 1 D) with a wavelength of 630 nm) from the HF-pumped ionosphere, obtained in September 2004 at the SURA heating facility situated near Nizhny Novgorod, Russia. For vertical pumping the airglow patch was increasingly displaced to the north, up to 7-8 • , with increasing reflection altitude. For large brightness of the emission, the airglow patch started to develop at the northern edge of the pump beam and later expanded to the south. These effects are attributed to the precipitation of supra-thermal electrons from the pump wave upper hybrid resonance altitude to lower altitudes where excitation of the O( 1 D) level is more effective due to the larger density of atomic oxygen, and the O( 1 D) lifetime is shorter. For a pump beam inclination of 12 • to the south, the optical spot was displaced by 4-5 • to the south relative to the straight-line projection of the pump beam onto the sky. This exceeds that expected from the ray tracing and may be related, most probably, to the so-called "magnetic zenith" effect. In addition, mid-scale (1-10 km) magnetic field-aligned structures were observed in the pumped volume of the ionosphere. The east-west motions of the airglow patches are also analyzed.

show abstract

“…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: 96%