Excitation of electron cyclotron harmonic waves in Ionospheric Modification Experiments

摘要: We investigate the resonance excitation of electrostatic as well electromagnetic electron cyclotron harmonic waves by mode conversion during ionospheric F region modification experiments when pump wave frequency is near harmonics frequency. In case we calculate bandwidth around each within which Bernstein possible. For typical parameters found to be order a few kilohertz in good agreement with dependence and quenching downshifted maximum (DM) feature recent at Tromso (Norway) Arecibo (Puerto Rico). there exist ranges fast branch X can directly converted into waves. Excitation upper hybrid E means seems possible for certain parameter ranges. When second harmonic, enhanced both cases. Relevance these results various spectral features like DM, broad upshifted maximum, symmetrical structures stimulated emission from ionosphere pointed out.