RESONANCE BROADENING INDUCED NONLINEAR SATURATION TURBULENCE IN THE INTERPLANETARY PLASMA

The saturation of ion-cyclotron Alfven turbulence excited by beam part icles is investigated using the resonance broadening theory. The stoch astic scattering which decorrelates particles, includes both random ac celeration by electric fields and a turbulent magnetic mirroring effec t. Turbulent mirroring is shown to yield non-Gaussian corrections to t he orbits even if the random electric and magnetic fields are Gaussian . The predicted steady-state turbulence level exhibits a peaked angula r distribution, with a maximum near Theta similar or equal to 60 degre es.