Publication Date:
2017-04-04
Description:
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.
Description:
In press
Description:
1.6. Osservazioni di geomagnetismo
Description:
3.4. Geomagnetismo
Description:
JCR Journal
Description:
open
Keywords:
South Atlantic Anomaly
;
equivalent monopole source
;
Earth core topography
;
04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
;
04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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