It is shown that radiation due to impurities can cause an instability involving short-wavelength (compared to the ion gyroradius) electrostatic waves. The instability is closely associated with the electron-temperature-gradient-driven electron-acoustic and ion drift modes. Dissipative effects are shown also to play an important role.

• Received 19 September 1989

DOI:https://doi.org/10.1103/PhysRevA.41.2215