Electrostatic Waves and Instabilities in Homogeneous, Magnetized Plasmas
The linear theory of electrostatic waves in homogeneous, unmagnetized as well as magnetized plasmas will be presented. The dispersion relation for the different wave types will be derived on the basis of a fluid theory and a kinetic theory. Particular attention will be payed to ion acoustic waves and ion cyclotron waves in the low frequency regime, and to electron plasma waves (“Langmuir waves”) and electron Bernstein waves in the high frequency regime. Different instabilities leading to the excitation of these waves will be discussed. Here the emphasis will be on beam instabilities, e.g. the ion beam instability and the electron beam instability, and on the current driven instabilities, e.g. the current driven ion acoustic waves and ion cyclotron waves. The importance of the different waves and instabilities for the dynamical behaviour of the plasma will be illustrated by examples from laboratory experiments and space observations.
KeywordsDispersion Relation Langmuir Wave Electrostatic Wave Unmagnetized Plasma Electron Plasma Wave
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