Nonlinear Processes in Geophysics www.nonlin-processes-geophys.net 1023-5809 1607-7946 6 2 1999 10.5194/npg-6-99-1999 http://www.nonlin-processes-geophys.net/6/99/1999/ http://www.nonlin-processes-geophys.net/6/99/1999/npg-6-99-1999.html http://www.nonlin-processes-geophys.net/6/99/1999/npg-6-99-1999.pdf 99 127 0000-00-00 Comments and new results about the magnetospheric chaos hypothesis G. P. Pavlos M. A. Athanasiu D. Diamantidis A. G. Rigas E. T. Sarris Department of Electrical and Computer Engineering, Demokritos University of Thrace, 67100 Xanthi, Greece In this study we present theoretical concepts and results concerning the hypothesis test of the magnetospheric chaos. For this reason we compare the observational behavior of the magnetospheric system with results obtained by analysing different types of stochastic and deterministic input-output systems. The results of this comparison indicate that the hypothesis of lowdimensional chaos for the magnetospheric dynamics remains a possible and fruitful concept which must be developed further.