Resonance scattering of an extraordinary wave by a smoothed-walled duct with decreased density in a magnetoplasma

Scattering of a plane extraordinary wave by a smoothed-walled duct with decreased density in a magnetoplasma is studied. The emphasis is placed on the behavior of the surface and volume plasmon resonances of such a duct and on their comparison with the corresponding resonances of a sharpwalled duct. Analytical and numerical results are given for the scattering and absorption characteristics of a decreased-density duct in the upper hybrid frequency range of a magnetoplasma as functions of the steepness of the density nonuniformity in the duct wall.