If the RF noise appears in certain bands (as the article says), that would indicate resonant properties of the plasma, such as the ring being 1/2 wavelength, or

If the RF noise appears in certain bands (as the article says), that would indicate resonant properties of the plasma, such as the ring being 1/2 wavelength, or some other mode. Would be interesting to know. Plasma antennas have been demonstrated, but those are encased in dielectric tubes. I’m sure the noise temperature is horrible.