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Authors: Consolini, G.* 
De Michelis, P.* 
Meloni, A.* 
Title: Fluid motions in the Earth’s core inferred from time spectral features of the geomagnetic field
Issue Date: 2002
Series/Report no.: 3 / 65 (2002)
DOI: 10.1103/PhysRevE.65.037303
Keywords: Geomagnetism
Secular variation
Earth's core
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics 
04. Solid Earth::04.05. Geomagnetism::04.05.01. Dynamo theory 
04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field 
Abstract: 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.
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