Dynamics of the 3D FMS waves beam in plasma with stochastic fluctuations of magnetic field

The dynamics of the 3D fast magneto-sonic wave beam in plasma with stochastic fluctuations of field is studied using the model of stochastic KP equation generalized by introducing of the next dispersive term. The fluctuations of external magnetic field are described by the inhomogeneous term η(x, ρ, t). It is shown numerically that independently on the coherent length of noise, ln, the FMS wave beam disperses acquiring wave structure with propagation even under conditions when it must stabilize for the field fluctuations absence. The evolution is ended with the turbulent field formation independently on the values of dispersive parameters and intensities of beam ht=0 and noise η for any correlation between the characteristic lengths of wave lw and ln. (author)