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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 | Journal: | Pure and Applied Geophysics | Series/Report no.: | 4 / 149 (1997) | Publisher: | Birkhäueser Verlag | Issue Date: | Aug-1997 | Keywords: | Geomagnetism spatial power spectra fractals |
Subject Classification: | 04. 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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