STOCHASTIC FORCES IN-SPACE PLASMAS WITH ION-ACOUSTIC AND LOWER-HYBRID-DRIFT TURBULENCE

A Langevin equation for charged particles in a plasma with electrostat ic turbulence is developed from first principles and in consistency wi th the kinetic theory in polarization approximation. For the case of i on-acoustic and electrostatic lower-hybrid-drift turbulence approximat e expressions for the space-time spectral density of the wave energy a re given and estimates of the intensities of the stochastic wave force s are made. The application is done for the plasmas of the earth's mag netosphere, the solar wind and solar hares. It seems, that ion-acousti c and electrostatic lower-hybrid-drift waves can contribute to electro n chaotization in different regions of the space plasma.