Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 8 5 2008 10.5194/nhess-8-1009-2008 http://www.nat-hazards-earth-syst-sci.net/8/1009/2008/ http://www.nat-hazards-earth-syst-sci.net/8/1009/2008/nhess-8-1009-2008.html http://www.nat-hazards-earth-syst-sci.net/8/1009/2008/nhess-8-1009-2008.pdf 1009 1017 2008-09-17 Ionospheric conductivity effects on electrostatic field penetration into the ionosphere V. V. Denisenko M. Y. Boudjada mohammed.boudjada@oeaw.ac.at M. Horn E. V. Pomozov H. K. Biernat K. Schwingenschuh H. Lammer G. Prattes E. Cristea Institute of Computational Modeling, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russia Siberian Federal University, Krasnoyarsk, Russia Space Research Institute, Austrian Academy of Science, Graz, Austria Institute of Physics, Department of Geophysics, Astrophysics and Meteorology, Karl-Franzens-University Graz, Austria Institute of Physics, Department of Theoretical Physics, Karl-Franzens-University Graz, Austria Communication Networks and Satellite Communications Institute, Technical University Graz, Austria The classic approach to calculate the electrostatic field penetration, from the Earth's surface into the ionosphere, is to consider the following equation &nabla;&middot;(&sigma;&middot;&nabla;&Phi;)=0 where &sigma; and Φ are the electric conductivity and the potential of the electric field, respectively. The penetration characteristics strongly depend on the conductivities of atmosphere and ionosphere. 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