Geomagnetic field intensity variations in Northwestern-Central Russia between the 12th and 19th century AD

Natalia Salnaia, Institute of Physics of the Earth RAS, Moscow, Russia, Yves Gallet, CNRS, Paris Cedex 16, France; Institut de Physique du Globe de Paris, Paris, France, Agnes Genevey, CNRS / Université Pierre et Marie Curie, Laboratoire d'Archéologie Moléculaire et Structurale, UMR 8220, Paris, France, Ilya Antipov, Saint Petersburg State University, Saint Petersburg, Russia and Denis Elshin, The State Hermitage Museum, Saint-Petersburg, Russia