Linear mode conversion of waves near the maxima or minima of the density in a warm magnetized plasma

Behavior of the high frequency electrostatic waves near the plasma or upper hybrid resonances was studied for the case that these resonances are situated at the maxima or the minima of plasma density. Supposing a parabolic density profile in these regions the connection formulae were obtained for the WKB solutions. In a weakly inhomogeneous magnetoplasma the effect of the parabolic profile manifests itself only in a narrow frequency band centred at the resonance frequency corresponding to the extreme value of the density. The whole process can then be described by only two coefficients, viz., the power conversion and transmission cofficients. (author). 4 figs., 1 tab., 7 refs