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Radiative modes associated with a thin, infinitely long circular plasma cylinder and having dipolar azimuthal field variations are investigated. The plasma is treated as a lossless dielectric with ε = ε0(1 − ωp2/ω2). No thermal effects are considered, and, contrary to the strong background magnetic field case investigated by Dawson and Oberman, no background magnetic field is introduced. The procedure requires the investigation of the dispersion equation resulting from the matching of tangential electromagnetic field components across a plasma-free space boundary, with emphasis on satisfying the radiation boundary conditions. Modes having axial phase velocities in the range c < vp < ∞ are shown to exist and are analyzed. A comparison with the analog of such modes for cylinders of finite length, which have been experimentally verified, is made, indicating the utility of the infinite structure analysis in explaining the experimental results for radiative modes on finite structures.

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