Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/864
AuthorsDe Michelis, P.* 
Consolini, G.* 
TitleTime intermittency and spectral features of the geomagnetic field
Issue Date2004
Series/Report no.47 (6)
URIhttp://hdl.handle.net/2122/864
Keywordsnonlinear processes in geophysics
geomagneticfield
Earth's core
fluid dynamics
turbulence
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous 
04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field 
AbstractIn the field of geomagnetism a number of studies have been devoted to the investigation of turbulence and intermittency in the outer core fluid motions. Here, in order to obtain information on such phenomena we study the time spectral and self-similarity features of the main geomagnetic field fluctuations as measured on the Earth’s surface. The existence of a power law spectrum, characterised by an exponent a˜-11/3, and an anomalous scaling of q-th order structure functions on time scales longer than 5 years, suggests the occurrence of intermittent turbulence rather than classical Kolmogorov turbulence in the fluid core motions. These results are briefly discussed in connection with the existence of a strong magnetic field and drift-wave turbulence.
Appears in Collections:Annals of Geophysics

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