Low-dimensional chaos in magnetospheric activity from AE time series

Details Low-dimensional chaos in magnetospheric activity from AE time series Low-dimensional chaos in magnetospheric activity from AE time series

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1841v&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Oct. 1990, p. 1841-1844.

Physics

82

Auroral Electrojets, Chaos, Magnetospheric Instability, Solar Wind, Time Series Analysis, Equations Of Motion, Interplanetary Magnetic Fields, Kolmogoroff Theory

Scientific paper

The magnetospheric response to the solar-wind input, as represented by the time-series measurements of the auroral electrojet (AE) index, has been examined using phase-space reconstruction techniques. The system was found to behave as a low-dimensional chaotic system with a fractal dimension of 3.6 and has Kolmogorov entropy less than 0.2/min. These indicate that the dynamics of the system can be adequately described by four independent variables, and that the corresponding intrinsic time scale is of the order of 5 min. The relevance of the results to magnetospheric modeling is discussed.

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