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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Authors: | V L Frolov D I Nedzvetsky V P Uryadov V A Ivanov D V Ivanov A R Lashchevsky N V Ryabova |
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Institution: | (1) Radiophysical Research Institute, Nizhny Novgorod, Russia;(2) Mari State Technical University, Ioshkar-Ola, Russia |
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Abstract: | We present the results of studying the properties of artificial F-spread that appears on ionograms during heating of the ionospheric
F2 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
Δf = fPW − nfce and has the minimum value for Δf ≈ −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 fPW ≈ nfce is analyzed.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 51, No. 5, pp. 367–375, May 2008. |
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