Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9913239t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A7, p. 13,239-13,249
Physics
18
Auroral Electrojets, Earth Ionosphere, Fractals, Geomagnetism, Noise Spectra, Power Spectra, Random Noise, Autocorrelation, Chaos, Strange Attractors, Time Series Analysis
Scientific paper
A detailed analysis has been made of 13 periods of 20 days of the AE data. The average correlation dimension is found to be 3.4, and the calculated dimension is found to depend on the magnetospheric activity such that more active periods have smaller dimensions. This apparent correlation dimension does not, however, imply that the magnetospheric system behind the AE data is low-dimensional. On the contrary, biocolored noise is shown to share many properties with the AE data. The AE time series is also found to be self-affine such that the scaling exponent changes at the time scale of about 2 hours. This same time scale is suggested to appear as a spectral break at about 1/(5 hours) in the power spectrum of the AE data.
Koskinen Hannu
Takalo Jouni
Timonen Jussi
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