Characterization of sub-ionospheric VLF/LF waveguides for seismic event studies during solar minimum
- 1Space Research Institute, Austrian Academy of Sciences, Graz, Austria (hue@oeaw.ac.at)
- 2Schmidt Institute of Physics of the Earth, RAS, Moscow, Russia
- 3Department of Physics, University of Bari, Bari, Italy
In this study we present measurements and simulations of mid-latitude sub-ionospheric propagation paths between several VLF/LF transmitters and the Graz seismo-electromagnetic receiver facility (Schwingenschuh etal, 2011) during the current solar minimum condition. The upper D/E-region boundary of the waveguide is stable during the low solar activity in the years 2018 and 2019, i.e. measured VLF/LF amplitude and phase variations are mainly due to natural excitations from the lithosphere, atmosphere, and man-made disturbances. In particular, this period gives a baseline to characterize VLF amplitude and phase modulations in the waveguide cavity related to seismic activity over Europe. In addition, this opportunity let us probe the signal threshold and feed-back into waveguide simulation models. We conclude, proven long-term VLF/LF measurements, the continuous monitoring of the cavity, could be valuable in the assessment of seismic hazard scenarios.
Ref:
Schwingenschuh, K., Prattes, G., Besser, B. P., Mocnik, K., Stachel, M., Aydogar, Ö., Jernej, I., Boudjada, M. Y., Stangl, G., Rozhnoi, A., Solovieva, M., Biagi, P. F., Hayakawa, M., and Eichelberger, H. U.: The Graz seismo-electromagnetic VLF facility, Nat. Hazards Earth Syst. Sci., 11, 1121–1127, https://doi.org/10.5194/nhess-11-1121-2011, 2011.
How to cite: Eichelberger, H., Schwingenschuh, K., Boudjada, M. Y., Besser, B. P., Wolbang, D., Rozhnoi, A., Solovieva, M., Biagi, P. F., Stachel, M., Aydogar, Ö., Muck, C., Grill, C., and Jernej, I.: Characterization of sub-ionospheric VLF/LF waveguides for seismic event studies during solar minimum, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-15760, https://doi.org/10.5194/egusphere-egu2020-15760, 2020