Generation of electric and diffusion currents (magnetic fields) in arbitrarily moving media by electromagnetic radiation

An arbitrarily moving medium, e.g. plasma, under the influence of an electromagnetic and gravitational field is considered. After solving the equation of motion for the charged particles by using a special approximation technique the expressions for the electric current density and the diffusion current density are calculated. Of particular interest is the generation of an electric current, i.e. also a magnetic field, by the Poynting vector. The corresponding material coefficients show a characteristic frequency dependence. Numerical estimates exhibit an interesting order of magnitude of the expected effects. (author)