Publicado 4 números por año
ISSN Imprimir: 1093-3611
ISSN En Línea: 1940-4360
Indexed in
CHARACTERIZATION OF COMPLEX DYNAMICAL REGIMES, UP TO SPATIO-TEMPORAL CHAOS, IN PLASMAS
SINOPSIS
Characterizing space-time fluctuations is of first importance to understand the non linear phenomena involved in unstable or turbulent fluid or plasma flows.
Along with the great development observed during the last years in non linear dynamics, new methods in data processing have been proposed.
Among these methods the biorthogonal decomposition (BD), enabling to reduce space-time data with the maximum efficiency to a finite set of separate modes is a particularly convenient tool. The eigenmodes come out from the numerical analysis and are not imposed from outside as in the Fourier decomposition.
Making a partial reconstruction from the weighted sum of spatial and temporal eigenfunctions obtained gives a mean to separate coherent structures from background stochastic fluctuations.
After a short description of the BD we present two illustrative examples. Both of them are devoted to the characterization of transitions from regular to spatio-temporal chaos or turbulence in laboratory plasmas.