Causal correlation between helicon dispersion and absorption in plasma

Using the generalized Kramers-Kronig relations between the real and the imaginary part of the function of the dielectric response, the absorption of longitudinal waves in plasma is calculated. The basic assumption for the calculation of this absorption is the knowledge of dispersion of longitudinal waves. In the present case, the dispersion in long-wave approximation was used. Energy losses of longitudinal waves calculated which are causally connected with the chosen dispersion are compared with published data. (author)