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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 6
Nonlin. Processes Geophys., 14, 701–708, 2007
https://doi.org/10.5194/npg-14-701-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Extreme Events: Nonlinear Dynamics and Time Series Analysis

Nonlin. Processes Geophys., 14, 701–708, 2007
https://doi.org/10.5194/npg-14-701-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  23 Nov 2007

23 Nov 2007

Analysis of global geomagnetic variability

V. Anh1,2, Z.-G. Yu1,3, and J. A. Wanliss4 V. Anh et al.
  • 1School of Mathematical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Q4001, Australia
  • 2Florida Space Institute, University of Central Florida, Orlando, Florida, 32816-2370, USA
  • 3School of Mathematics and Computational Science, Xiangtan University, Hunan, 411105, China
  • 4Embry-Riddle Aeronautical University, 600 S. Clyde Morris Blvd., Daytona Beach, Florida, 32114, USA

Abstract. The orthogonal field components from global INTERMAGNET magnetometer stations are studied via multifractal detrended fluctuation analysis to determine whether there are clear and consistent regional patterns in the behavior of the fluctuations. There are three distinct scaling regimes in the qth-order fluctuation function for each of the 24 stations studied covering Southwest North America, Northeast North America, Central Europe, Northern Europe, Australasia and Asia. There is a consistent break point at time scale around 23 h for all stations. The scaling exponents of the second-order fluctuation functions reflect the regional character of the stations, and can be used for station classification, and for possible regional models.

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