Results 11 to 20 of about 317 (130)

First Full Vector Archeomagnetic Data From Northern Mexico [PDF]

Geochemistry, Geophysics, Geosystems, 2021
AbstractSeveral regional secular variation curves of the geomagnetic field have been proposed for Mexico over the last millennia. Despite a fairly large number of archeomagnetic data, these curves remain imprecise because of an uneven quality and geographic distribution, with a lack of data in Northern Mexico.
Madingou, B, Perrin, Mireille, Hervé, Gwenaël, Cardona, A, Alva- Valdivia, L, Cruz Antillón, R.   +5 more
openaire   +5 more sources

Cooling Rate Correction in Paleointensity Experiments on Archeological and Geological Materials

Geochemistry, Geophysics, Geosystems
Obtaining accurate estimates of the absolute intensity of the past geomagnetic field (paleointensity) is one of the major challenges in paleomagnetic research.
Ron Shaar
doaj   +2 more sources

Archeomagnetic Intensity Spikes: Global or Regional Geomagnetic Field Features? [PDF]

Frontiers in Earth Science, 2018
Variations of the geomagnetic field prior to direct observations are inferred from archeo- and paleomagnetic experiments. Seemingly unusual variations not seen in the present-day and historical field are of particular interest to constrain the full range
Monika Korte, Catherine G. Constable
doaj   +5 more sources

Archaeomagnetism in the Levant and Mesopotamia Reveals the Largest Changes in the Geomagnetic Field. [PDF]

J Geophys Res Solid Earth, 2022
Abstract Our understanding of geomagnetic field intensity prior to the era of direct instrumental measurements relies on paleointensity analysis of rocks and archaeological materials that serve as magnetic recorders. Only in rare cases are absolute paleointensity data sets continuous over millennial timescales, in sub‐centennial resolution, and ...
Shaar R, Gallet Y, Vaknin Y, Gonen L, Martin MAS, Adams MJ, Finkelstein I.   +6 more
europepmc   +2 more sources

Correlation based time evolution of the archeomagnetic field [PDF]

Journal of Geophysical Research: Solid Earth, 2020
Abstract In a previous study, a new snapshot modeling concept for the archeomagnetic field was introduced (Mauerberger et al., 2020, https://doi.org/10.1093/gji/ggaa336 ).
Schanner, M., Mauerberger, S., Korte, M., Holschneider, M., Mauerberger, S.; 2 Applied Mathematics University of Potsdam Potsdam Germany, Korte, M.; 1 German Research Centre for Geosciences GFZ Section 2.3 Potsdam Germany, Holschneider, M.; 2 Applied Mathematics University of Potsdam Potsdam Germany   +6 more
openaire   +6 more sources

Modeling geomagnetic spikes: the Levantine Iron Age anomaly

Earth, Planets and Space, 2023
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
Pablo Rivera, F. Javier Pavón-Carrasco, María Luisa Osete   +2 more
doaj   +1 more source

ArchKalmag14k: A Kalman‐Filter Based Global Geomagnetic Model for the Holocene

Journal of Geophysical Research: Solid Earth, Volume 127, Issue 2, February 2022., 2022
Abstract We propose a global geomagnetic field model for the last 14 thousand years, based on thermoremanent records. We call the model ArchKalmag14k. ArchKalmag14k is constructed by modifying recently proposed algorithms, based on space‐time correlations. Due to the amount of data and complexity of the model, the full Bayesian posterior is numerically
M. Schanner, M. Korte, M. Holschneider
wiley   +1 more source

The time-dependence of intense archeomagnetic flux patches [PDF]

Journal of Geophysical Research, 2011
[1] The long‐term temporal behavior of intense geomagnetic flux patches at the core‐mantle boundary and the relation with lower mantle lateral heterogeneity are under debate. We apply an algorithm to detect centers of intense flux patches and track their time‐evolution in a recent archeomagnetic field model in order to study the kinematics of such ...
Amit, Hagay, Korte, Monika, Aubert, Julien, Constable, Catherine, Hulot, Gauthier   +4 more
openaire   +5 more sources

ThellierCoolPy: A Cooling‐Rate Correction Tool for Paleointensity Data

Geochemistry, Geophysics, Geosystems, Volume 22, Issue 12, December 2021., 2021
Abstract We report a new approach of implementing cooling‐rate corrections in absolute ancient magnetic field intensity (paleointensity) studies. Nearly all methods of determining paleointensity estimates rely on rocks having recorded a thermoremanent magnetization (TRM), on cooling from above the rock’s constituent minerals’ Curie temperature ...
Adrian R. Muxworthy, Evelyn B. Baker
wiley   +1 more source

Transdimensional inference of archeomagnetic intensity change [PDF]

Geophysical Journal International, 2018
One of the main goals of archeomagnetism is to document the secular changes of Earth's magnetic field by laboratory analysis of the magnetization carried by archeological artefacts. Typical techniques for creating a time-dependent model assume a prescribed temporal discretisation which, when coupled with sparse data coverage, require strong ...
Livermore, Philip, Fournier, Alexandre, Gallet, Yves, Bodin, Thomas   +3 more
openaire   +4 more sources