Abstract
In the previous chapter, the collisionless waves have been reviewed using the cold plasma approximation. The two-stream instability of cold beams demonstrates that the situation changes drastically when particles have motion. Now let us study the conditions for the appearance of waves in kinetic plasma processes including thermal and non-thermal particle motions. The goal of this chapter is to understand instability, saturation, and (collisionless!) damping of waves in kinetic plasma theory. For this purpose we start with electron beams and study the sources of a particular kind of solar radio emission (so called type III or fast-drift bursts). They are the best known major kinetic plasma process in astrophysics and the showpiece of solar radio astronomy. Yet they are still not fully understood nor exhaustively observed (in particular near the Sun). Other cases of waves and instabilities in kinetic plasma are presented in the following chapters.
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