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Authors: De Santis, A.*
Qamili, E.*
Title: Equivalent monopole source of the geomagnetic South Atlantic Anomaly
Title of journal: Pure and Applied Geophysics
Publisher: Springer
Issue Date: May-2009
Keywords: South Atlantic Anomaly
equivalent monopole source
Earth core topography
Abstract: The South Atlantic magnetic Anomaly (SAA) is an important feature of the present geomagnetic field. In this paper we model the space-time evolution of this anomaly for the last 400 years in terms of the resultant between a decrease of a global axial dipole and an increase of a virtual local monopole source. Some characteristics of this evolution are investigated and some considerations are made on the light of a possible special state of the global geomagnetic field dynamical regime. Among the possible speculations, one is made regarding the topography of the core-mantle boundary (CMB) and its possible aspect underneath the SAA region in terms of simple sinusoidal undulations met by the monopole source during its centennial motion.
Appears in Collections:04.05.02. Geomagnetic field variations and reversals
04.05.04. Magnetic anomalies
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