INTERACTION OF UPPER AND LOWER-HYBRID WAVES AND GENERATION OF THE DOWNSHIFTED MAXIMUM FEATURE OF STIMULATED ELECTROMAGNETIC EMISSIONS

The decay of an upper hybrid (UH) wave to a lower hybrid (LH) wave and a daughter upper hybrid wave is considered. The linear stage of the p rocess was analyzed for ionospheric conditions and compared with exper imental data as well as with theoretical results of other authors. It was shown that the effective excitation of the prominent downshifted m aximum feature of stimulated electromagnetic emissions in the ionosphe ric modification experiments could take place possibly due to interact ion between two oblique UH waves and a heavily damped LH wave. (C) 199 7 Elsevier Science Ltd.