Identification of Ion-Cyclotron Drift Instability with Discrete and Continuous Spectra

Abstract

Ion-cyclotron drift waves with discrete and continuous spectra are identified by measurements of $\omega$ and $\overrightarrow{\mathrm{k}}$ and explained by a theory which includes parallel electron current. This instability has a spectrum and effects on the plasma similar to those of ion sound, and can exist in plasmas which are ion-sound stable.