%0 Journal Article
%T Coherent amplitude modulation of electron-beam-driven Langmuir waves
%A K. Baumg rtel
%J Annales Geophysicae (ANGEO)
%D 2013
%I Copernicus Publications
%X A linear approach to the phenomenon of irregular amplitude modulation of beam-driven Langmuir waves, developed in a previous paper, is extended to explain periodic modulation as well. It comes about by beating of the fastest growing mode of the instability with beam-aligned plasma oscillations. They are naturally generated in a uniform domain of beam¨Cplasma interaction prior to the onset of the instability. Particle-in-cell (PIC) simulations support the results of the linear analysis.
%U http://www.ann-geophys.net/31/633/2013/angeo-31-633-2013.html