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Authors: De Santis, A.* 
Barraclough, R.* 
Title: A Fractal Interpretation of the Topography of the Geomagnetic Scalar Potential at the Core-mantle Boundary
Issue Date: Aug-1997
Series/Report no.: 4 / 149 (1997)
Keywords: Geomagnetism
spatial power spectra
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics 
04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 
04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field 
Abstract: The spatial power spectrum of the scalar potential (V) of the main geomagnetic field shows a power-law behaviour at the core-mantle boundary (CMB) and an almost uniform distribution of the corresponding phases. This is strong evidence for a fractal topography of V having a non-integer dimension of 2.2 (with an uncertainty of ±0.1) which is, indeed, found from an analysis of the power spectra of 32 spherical harmonic models of V spanning the interval 1647 to 1990.
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