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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 9
Ann. Geophys., 21, 2025–2030, 2003
https://doi.org/10.5194/angeo-21-2025-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Complexity in the Earth's Magnetospheric Dynamics

Ann. Geophys., 21, 2025–2030, 2003
https://doi.org/10.5194/angeo-21-2025-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Sep 2003

30 Sep 2003

Measurement of the stochasticity of low-latitude geomagnetic temporal variations

J. A. Wanliss and M. A. Reynolds J. A. Wanliss and M. A. Reynolds
  • Department of Physical Sciences, Embry-Riddle Aeronautical University, 600 S. Clyde Morris Blvd., Daytona Beach, FL 32114, USA

Abstract. Ground magnetometer measurements of total magnetic field strength from 6 stations at low latitudes were analyzed using power spectrum and Hurst range scaling techniques. The Hurst exponents for most of these time-series were near 0.5, which indicates stochasticity, with the highest latitude stations exhibiting some persistence with Hurst exponents greater than 0.6. Although no definite correlations are evident, the relative increase of the Hurst exponent with latitude suggests the possibility that the underlying dynamics of the magnetosphere change with latitude. This result may help quantify the dynamics of the inner magnetosphere itself without the direct presence of the solar wind driver.

Key words. Magnetospheric physics (magnetospheric configuration and dynamics; plasmasphere) – Space plasma physics (nonlinear phenomena)

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