Institution: | (1) Institute of Physics of the Earth, Moscow, 123810, Russia;(2) Laboratoire de Physique et Chimie de l Environnement, Centre National de la Recherche Scientifique, Orléans, France;(3) Geophysical Institute, , Czech Academy of Sciences, Prague, Czech Republic;(4) Department of Physical Sciences, University of Oulu, P.O. Box 3000, FIN-90014, Finland;(5) Sodankylä Geophysical Observatory, Sodankylä, FIN-99600, Finland |