Spontaneous Emission of Electromagnetic Waves by a Semi-bounded Non-equilibrium Plasma

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Abstract
The boundary value problem of an anisotropic plasma half-space excitation by the given space-time distribution of sources is solved. The energy relations are determined for the spontaneous emission from a semi-bounded non-equilibrium plasma. The generalization of the well-known results of classical radiation theory is established (in particular, Kirchhoff's law) for the case of non-equilibrium emission from a half-space of anisotropic plasma.The quasistatic surface excitation spectra are investigated in a one-component plasma with a low-density electron beam and in a non-isothermal electron-ion plasma with electron drift relative to the ions. The possible instability of such excitations and the anomal effective temperature growth for the quasistationary part of the spontaneous field are shown. The threshold values of the electron beam velocities for various branches of the surface excitations are calculated.