Phys. Rev. E 65, 037303 (2002) [4 pages]Fluid motions in the Earth’s core inferred from time spectral features of the geomagnetic fieldReceived 23 July 2001; published 7 March 2002 The aim of this work is to investigate the time spectral features of the main geomagnetic field fluctuations as measured on the Earth’s surface in connection with a nontraditional turbulent dynamics of the fluid motions in the outer layers of the Earth’s liquid core. The average geomagnetic field spectrum is found to be a power law, characterized by a spectral exponent α≈-11/3, on time scales longer than 5 yr. We discuss the spectral exponent in connection with an intense magnetic field in the Earth’s core and with a vortex coalescence process in a regime of drift-wave turbulence. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.65.037303
DOI:
10.1103/PhysRevE.65.037303
PACS:
91.25.Cw, 47.27.-i, 91.25.Le, 47.65.+a
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