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High frequency current-carrying spokes are observed propagating in theE$\times$B direction in a neon direct current magnetron discharge. Two modesare found with distinct frequencies and behaviors. At low discharge currents,we see highly coherent 60 MHz fluctuations. Above a distinct current threshold,secondary 5 - 10 MHz fluctuations emerge in addition to turbulent fluctuationsspanning the 60 - 100 MHz range. The presence of lower-hybrid waves is invokedto explain the high frequency oscillations. We attribute the appearance of thelow frequency axial modes concomittant with the onset of the high frequencyturbulence to an inverse cascade process, as suggested by recent simulations.

Evidence of lower-hybrid rotating spoke oscillations in a direct current magnetron microdischarge