Electromagnetic Waves in Parameter Space for Finite Magnetoplasmas

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Abstract

<jats:p>High-frequency electromagnetic waves guided by an air-bounded, axially magnetized, plasma column of radius a are studied through the technique of parameter space mapping. The parameter space is 3-dimensional with coordinates ωp/ω, ωb/ω, and c/ωa. In this 3-space, cutoff and resonance loci form surfaces which enclose approximate domains of existence for various classes of waves.</jats:p> <jats:p>Three wave classes, characterized by distinctive cutoff and resonance surfaces, are identified for a magnetized plasma column, and their relation to waves in a boundless plasma, and on a column of small radius (quasistatic waves) is investigated. Also, evidence is found for the continued existence of the surface wave class into the regime ωb&gt;ωp.</jats:p> <jats:p>Parameter space analysis leads to a determination of salient dispersion characteristics for all wave classes and all order of azimuthal variation by a method contributing to physical insight but which avoids exact but laborious numerical computation. Waves are found which change from forward to backward or vice versa with increasing wave number.</jats:p>

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