Plasma maser theory of high-frequency electrostatic waves in the presence of a coherent whistler mode

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Abstract
In this paper we show that a high-frequency electrostatic plasma instability occurs because of a new mode-coupling effect in plasma turbulence (bremsstrahlung instability). In the presence of a coherent low-frequency whistler mode and a high-frequency electrostatic test wave, this instability occurs because of a resonant interaction between electrons and modulated electric fields. The growth of the high-frequency wave occurs at the particular phase relative to the coherent whistler mode. The theory agrees with the recent experiments in space and laboratory.