Institution: | 1.Radiophysical Research Institute of N. I. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia ;2.Polar Geophysical Institute, Apatity, Russia ;3.Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia ;4.N. I. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia ;5.Sodankyl? Geophysical Observatory of the University of Oulu, Sodankyl?, Finland ; |