A method is developed and experiments are carried out for studying the possibility of selective excitation of characteristic waves in the ionosphere. The results of the experiment indicate that one characteristic wave can be excited steadily, and the ratio of the mean power values of the damped and undamped waves can be brought to 10. It is shown that the gain in the noise immunity when receiving such a single-mode signal, compared with the double-mode one, is 10-20 dB.
Department of Physics of Atmosphere and Mathematical Geophysics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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