Atmospheric and ionospheric parameter variations inferred from sub-ionospheric seismo-electromagnetic VLF/LF observations. K. Schwingenschuh 1 , H. U. Eichelberger 1 , B. P. Besser 1 , G. Prattes 1 , M. Y. Boudjada 1 , G. Stangl 1 , D. Wolbang 2 ,
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Atmospheric and ionospheric parameter variations inferred from sub-ionospheric seismo-electromagnetic VLF/LF observations
K. Schwingenschuh1,H. U. Eichelberger1, B. P. Besser1, G. Prattes1, M. Y. Boudjada1,G. Stangl1,D. Wolbang2,
A. Rozhnoi3, M. Solovieva3, P. F. Biagi4, M. Friedrich5, H. Biernat1, and M. Hayakawa6,
1 IWF/ÖAW, Graz/Austria, 2 IGAM, KFU Graz, Graz/Austria,3 Institute of the Earth Physics, RAS, Moscow/Russia, 4 Department of Physics, University of Bari, Bari/Italy, 5 Institute of Communication Networks and Satellite Communications, Graz University of Technology, Graz/Austria, 6 The University of Electro-Communications (UEC), Advanced Wireless Communications Research Center, Chofu, Tokyo/Japan
Sub-ionospheric waveguide and results
Station network for combined invest-igations of local and mesoscale geophysical/ seismic phenomena, consisting of (i) VLF
only (red markers), (ii) VLF/LF (green), and (iii) South European Geo-magnetic Array (SEGMA) ULF (blue) receiving stations.
Sketch of Lithosphere-Atmosphere-Ionosphere (LAI) coupling related to earthquakes and possible influences on satellite and ground based measurements.
During the DEMETER operational phase 2004-2010 we conducted complementary seismo-electromagnetic ground based ULF, TEC and VLF investigations. This combined satellite - ground based multi-parameter SEM approach provides the possibility to differentiate
seismic from non-seismic events.
For sub-ionospheric VLF SEM studies performed in Graz the residual and the Terminator-Time (TT) methods is mainly used. (Wolbang 2012; Prattes 2011). The TT method is based on the anomalies of the VLF dawn and dusk amplitude depressions. The characteristic amplitude drop is well known and a result of new wave modes when the radio link crosses the terminator. Several years ago the University of Technology in Graz developed analytical (Ledinegg 1982) and numerical (Kirchner, Zach, Laback 1977) of the propagation of VLF radio waves in the sub-ionospheric wave guide.
VLF amplitude measurements for one year continuous operation on the path DHO-GRZ.
Map of the effective reflection height observed by DEMETER (see Toledo-Redondo 2012).