%0 Journal Article
%@ 1666-6070
%A Elaskar, Sergio
%A Sanmartín Losada, Juan Ramón
%D 2004
%F upm:21671
%I Asociación Argentania de Mecánica Computacional
%J Mecánica computacional
%P 2461-2476
%T Reduced three-wave model to study the hard transition to chaotic dynamics in Alfven wave-fronts
%U http://oa.upm.es/21671/
%V XXIII
%X The derivative nonlinear Schrödinger (DNLS) equation, describing propagation of circularly polarized Alfven waves of finite amplitude in a cold plasma, is truncated to explore the coherent, weakly nonlinear, cubic coupling of three waves near resonance, one wave being linearly unstable and the other waves damped. In a reduced three-wave model (equal damping of daughter waves, three-dimensional flow for two wave amplitudes and one relative phase), no matter how small the growth rate of the unstable wave there exists a parametric domain with the flow exhibiting chaotic dynamics that is absent for zero growth-rate. This hard transition in phase-space behavior occurs for left-hand (LH) polarized waves, paralelling the known fact that only LH time-harmonic solutions of the DNLS equation are modulationally unstable.