Interaction of oblique wave beam with ionospheric layer F2 |
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Authors: | IA Molotkov B Atamaniuk AV Popov |
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Institution: | 1. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, RAS, Troitsk, Moscow Region 142190, Russia;2. Space Research Center, PAS, 18A Bartycka, 00-716 Warsaw, Poland |
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Abstract: | Interaction of a powerful obliquely incident wave beam of decameter radio waves with the ionospheric F2 layer is analyzed. Much like the linear case, propagation through the natural anti-waveguide layer F2 splits the initial beam. Some part of its energy leaks through the ionospheric layer, the other part goes back along a downward trajectory. However, nonlinearity leads to further stratification of the ionospheric layer. A new feature, in comparison with the linear case, is appearing a narrow waveguide beneath the F2 layer maximum which traps a small part of the beam energy. We study the relationship between these parts of the wave field in a simplified model of parabolic F2 layer, with nonlinearity caused by thermal plasma expulsion from the high field intensity region. Analytical results are supplemented with numerical estimates of the effects. |
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Keywords: | Ionosphere HF wave propagation Powerful oblique wave beam Trajectory variational principle Artificial nonlinear waveguide Gaussian beam |
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