Articles | Volume 11, issue 3
Nonlin. Processes Geophys., 11, 303–312, 2004
https://doi.org/10.5194/npg-11-303-2004
Nonlin. Processes Geophys., 11, 303–312, 2004
https://doi.org/10.5194/npg-11-303-2004

  18 Jun 2004

18 Jun 2004

Analysis of the geomagnetic activity of the Dst index and self-affine fractals using wavelet transforms

H. L. Wei, S. A. Billings, and M. Balikhin H. L. Wei et al.
  • Department of Automatic Control and Systems Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, UK

Abstract. The geomagnetic activity of the Dst index is analyzed using wavelet transforms and it is shown that the Dst index possesses properties associated with self-affine fractals. For example, the power spectral density obeys a power-law dependence on frequency, and therefore the Dst index can be viewed as a self-affine fractal dynamic process. In fact, the behaviour of the Dst index, with a Hurst exponent H≈0.5 (power-law exponent β≈2) at high frequency, is similar to that of Brownian motion. Therefore, the dynamical invariants of the Dst index may be described by a potential Brownian motion model. Characterization of the geomagnetic activity has been studied by analysing the geomagnetic field using a wavelet covariance technique. The wavelet covariance exponent provides a direct effective measure of the strength of persistence of the Dst index. One of the advantages of wavelet analysis is that many inherent problems encountered in Fourier transform methods, such as windowing and detrending, are not necessary.