Modeling geomagnetic spikes: the Levantine Iron Age anomaly

Earth, Planets and Space

Full Paper

Pablo Rivera¹  María Luisa Osete¹  F. Javier Pavón-Carrasco¹ 

[1] Departamento de Física de La Tierra Y Astrofísica, Universidad Complutense de Madrid, Madrid, Spain;Instituto de Geociencias (IGEO, CSIC-UCM), Madrid, Spain;

关键词: Geomagnetism;    Archeomagnetism;    Archeointensity;    Levantine Iron Age anomaly;    Spherical harmonic modeling;   

DOI  :  10.1186/s40623-023-01880-x

 received in 2023-03-24, accepted in 2023-08-13,  发布年份 2023

来源: Springer

【 摘 要 】

The Levantine Iron Age anomaly (LIAA) is a regional short-decadal geomagnetic strength field variation located at the Levantine region characterized by high intensities with maximum virtual axial dipole moments around 190 ZAm2. It has been constrained by archeomagnetic data coming from Eastern Europe and Western Asia between 1050 and 700 BC. The LIAA can be related to a fast and spatially localized geomagnetic positive anomaly (spike) at the Earth’s surface. In this study, we model the LIAA by using a Fisher–von Mises function that fits the most recent archeomagnetic intensity database in the region. A spherical harmonic analysis is implemented for this spike function to perturb a base model in order to build a global reconstruction (perturbed-model) that reproduces the spatial and temporal characteristics of the LIAA. Our results show the importance of harmonic degrees from n = 3–4 to n = 20 to reconstruct the anomaly extension suggested by the database. Two maxima linked with the LIAA are reproduced by our global perturbed-model at the Levantine region at 950 BC and 750 BC. A third maxima in intensity around 500 BC is also observed, affecting the whole Europe.Graphical Abstract

【 授权许可】

CC BY   
© The Society of Geomagnetism and Earth, Planetary and Space Sciences / The Seismological Society of Japan / The Volcanological Society of Japan / The Geodetic Society of Japan / The Japanese Society for Planetary Sciences 2023

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