[en] Over the last few years the study of the dissipation of electromagnetic wave energy in a hot plasma has become perhaps one of the main problems of hot plasma physics and controlled thermonuclear fusion. The focus of attention is on the processes by which electromagnetic energy is transformed into potential plasma waves and the processes involving relaxation of the latter. In this paper the authors summarize the experimental research into these processes conducted at the Lebedev Physics Institute over the 10 cm wave band. In the case of an isotropic plasma the authors recorded non-linear generation of Langmuir noise, the energy density of which was found to be comparable, in order of magnitude, with that of a pump wave. They detected the generation of fast electron streams, the non-stationary character of the latter with respect to time, and non-linear trans-illumination of the plasma layer. In the case of magnetoactive plasma they studied the parametric excitation of oscillations at the upper hybrid frequency during its resonance with the first overtone of the pump wave. At the same time as excitation of the plasma noises they detected generation of fast electron streams, in the energy spectrum of which they recorded separate groups. It was also found that the effective collision frequency increases by 1-3 orders, compared to the pair collision frequency. In the region of magnetic waves close to the electron cyclotron resonance the authors observed forced Mandelstam-Brillouin scattering and kinetic instability of the plasma. It was found that the excitation of Langmuir ion noises preceded ''anomalous absorption'' of waves and ''anomalous heating'' of electrons. The authors further consider the possibility of an experimental study of anomalous heating in plasma in the region of the lower hybrid frequencies, using the Institute's L-2 stellarator