Geomagnetic field intensity variations in Western Europe over the past 1100 years
Agnès Genevey|Yves Gallet|Erwan Thébault|Sébastien Jesset|Maxime Le Goff
Ten archeointensity results have been obtained from brick and ceramic fragments collected in France precisely dated to between the tenth eighteenth centuries. Intensity experiments were performed using Triaxe protocol taking into account cooling rate thermoremanent magnetization anisotropy effects. Together with our previous Belgium, we computed a geomagnetic field intensity variation curve for Western Europe covering past 1100 years. This is characterized by general decreasing trend at millennial timescale punctuated three short peaks, during twelfth century, around 1350–1400 AD ∼1600 AD. A similar evolution but smoother variations due data scatter also observed lesser extent Eastern when all available fulfilling quality criteria are used. Comparison of climatic record derived fluctuations length Swiss glaciers shows good temporal concordance maxima detected over millennium colder episodes. comparison further discussed these episodes low rates 14 C production. common pattern both records recognized middle beginning If significant, such coincidences suggest dual solar origin century‐scale climate radionuclide production least millennium.
Geochemistry Geophysics Geosystems|HAL (Le Centre pour la Communication Scientifique Directe)|HAL (Le Centre pour la Communication Scientifique Directe)|HAL (Le Centre pour la Communication Scientifique Directe)