Abstract
Ultra low frequency (ULF) acoustic waves, propagating in the ionosphere, may produce a decrease of the ionospheric density of the F-layer. In turn, decreasing the density of the ionospheric plasma results in the increase of the transparency of the ionosphere for cosmic radio waves. In this paper, simulations of nonlinear frequency down-conversion of extremely low frequency (ELF) acoustic waves into ULF acoustic waves are presented. The propagation of excited ULF waves within the non-isothermal ionosphere is simulated, and the increase of the transparency of the ionospheric F-layer for cosmic radio waves due to plasma density modulation is also considered. We argue that this phenomenon takes place jointly with an increase of the transparency caused by the periodic structure of extremely low frequency (ELF) acoustic waves in the E-layer of the ionosphere. Both phenomena have previously been confirmed experimentally.
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