Results 31 to 40 of about 317 (130)
A regional archeomagnetic model for Europe for the last 3000 years, SCHA.DIF.3K: Applications to archeomagnetic dating [PDF]
Geochemistry, Geophysics, Geosystems, 2009 The available European database of archeomagnetic field values and instrumental data has been used to produce a regional model for the geomagnetic field in Europe for the last 3000 years (from 1000 B.C. to 1900 A.D., connecting with the epoch covered by the IGRF models).
Pavón-Carrasco, F. Javier +3 more
openaire +2 more sources
Correlation based snapshot models of the archeomagnetic field [PDF]
Geophysical Journal International, 2020 SUMMARY For the time stationary global geomagnetic field, a new modelling concept is presented. A Bayesian non-parametric approach provides realistic location dependent uncertainty estimates. Modelling related variabilities are dealt with systematically by making little subjective a priori assumptions. Rather than parametrizing the model
S Mauerberger +3 more
openaire +3 more sources
Explosive activity of the summit cone of Piton de la Fournaise volcano (La Réunion island): A historical and geological review [PDF]
, 2013 International audienceSummit explosive activity and collapses that form pit craters and calderas represent major volcanic hazards on a dominantly effusive, frequently active volcano like Piton de la Fournaise.
Di Muro, Andrea +5 more
core +2 more sources
A global archeomagnetic intensity data bank
Eos, Transactions American Geophysical Union, 1993 An up‐to‐date list of global archeomagnetic intensity (AI) data has been made [Lagios et al., 1992]. The data meet certain reliability criteria and the regional graphs produced were used to draw some geophysical conclusions.This compilation needed to be completed before new data was accumulated since existing models are tenaciously adhered to and can ...
L. Liritzis, E. Lagios
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Geomagnetic and Archeomagnetic Jerks: Where Do We Stand? [PDF]
Eos, Transactions American Geophysical Union, 2009 The Earth's magnetic field is generated mainly by a self‐sustaining dynamo in the fluid outer core. Known as the core or main field, the dynamo's magnetic field is not constant but changes with time, a phenomenon denoted as secular variation. Unfortunately, no common agreement exists about the definition of secular variation: While some use this term ...
Mandea, M., Olsen, N.
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Frontiers in Earth ScienceThe continuous update of the archeomagnetic database spanning the last 3,000 years has facilitated the refinement of geomagnetic field models, unveiling the presence of significant non-dipolar anomalies before instrumental measurements.
Pablo Rivera +8 more
doaj +1 more source
The time dependence of reversed archeomagnetic flux patches [PDF]
Journal of Geophysical Research: Solid Earth, 2015 AbstractArcheomagnetic field models may provide important insights to the geodynamo. Here we investigate the existence and mobility of reversed flux patches (RFPs) in an archeomagnetic field model. We introduce topological algorithms to define, identify, and track RFPs.
Terra‐nova, Filipe +3 more
openaire +2 more sources
Reconstruction of Core‐Surface Flows During the Last 3,300 Years
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.Abstract Understanding the Earth's magnetic field evolution requires examining the fluid flow at the core‐mantle boundary that drives the changes over different timescales. The inversion process to derive core‐surface flow velocities from secular variation data encounters non‐uniqueness issues, necessitating a priori assumptions that yield different ...
Pablo Rivera +2 more
wiley +1 more source
Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.Abstract The study of variations in geomagnetic field intensity over time and space is crucial to understand the evolution of the geodynamo and its interactions with the Earth's surface. In this work, we introduce the SAGEOMAG (South America GEOMAGnetic) database, a comprehensive and updated repository of geomagnetic field intensity records derived ...
Victor J. O. Marum +6 more
wiley +1 more source