Measurement of the stochasticity of low-latitude geomagnetic temporal variations

Details Measurement of the stochasticity of low-latitude geomagnetic temporal variations Measurement of the stochasticity of low-latitude geomagnetic temporal variations

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003angeo..21.2025w&link_type=abstract

Annales Geophysicae, vol. 21, Issue 9, pp.2025-2030

Physics

4

Scientific paper

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.

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