ABSTRACT
The charged particles in a plasma move randomly, interact with each other through their own electromagnetic forces, and also respond to perturbations that are applied externally. Therefore, a great variety of collective wave phenomena arises due to the coherent motions of an ensemble of plasma particles. It is well known (Ichimaru 1973, Chen 1974, Alexandrov et al 1984) that an electron-ion plasma supports both longitudinal and transverse waves. Examples of longitudinal waves in an unmagnetized plasma are Langmuir and ionacoustic waves which are accompanied with density and potential fluctuations. On the other hand, transverse waves in an unmagnetized plasma are purely electromagnetic and they do not accompany density fluctuations. The presence of an external magnetic field in a plasma provides the possibility of a great variety of longitudinal and transverse waves.
