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Ann. Geophys., 21, 2025-2030, 2003
www.ann-geophys.net/21/2025/2003/
© European Geosciences Union 2003
Measurement of the stochasticity of low-latitude geomagnetic temporal variations
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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