Impact of kinetic processes on the macroscopic nonlinear evolution of the electromagnetic-beam-plasma instability

We present a new, fully kinetic mechanism of generation of spatial magnetic vortices that results from the resonant wave-particle interaction in a pla sma. This phenomenon is of basic theoretical interest. It can be responsibl e for the magnetic vortices observed in numerical simulations in the wake o f an ultrastrong, ultraintense laser pulse in an underdense plasma.