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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 32, issue 12
Ann. Geophys., 32, 1487–1493, 2014
https://doi.org/10.5194/angeo-32-1487-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 32, 1487–1493, 2014
https://doi.org/10.5194/angeo-32-1487-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 09 Dec 2014

Regular paper | 09 Dec 2014

The numerical simulation on ionospheric perturbations in electric field before large earthquakes

S. F. Zhao1,2, X. M. Zhang2, Z. Y. Zhao1, and X. H. Shen2 S. F. Zhao et al.
  • 1Depart of Space Physics, School of Electronic information, Wuhan University, Wuhan 430072, China
  • 2Institute of Earthquake Science, China Earthquake Administration, Beijing 100081, China

Abstract. Many observational results have shown electromagnetic abnormality in the ionosphere before large earthquakes. The theoretical simulation can help us to understand the internal mechanism of these anomalous electromagnetic signals resulted from seismic regions. In this paper, the horizontal and vertical components of electric and magnetic field at the topside ionosphere are simulated by using the full wave method that is based on an improved transfer matrix method in the lossy anisotropic horizontally stratified ionosphere. Taken account into two earthquakes with electric field perturbations recorded by the DEMETER satellite, the numerical results reveal that the propagation and penetration of ULF (ultra-low-frequency) electromagnetic waves into the ionosphere is related to the spatial distribution of electron and ion densities at different time and locations, in which the ion density has less effect than electron density on the field intensity. Compared with different frequency signals, the minimum values of electric and magnetic field excited by earthquakes can be detected by satellite in current detection capability have also been calculated, and the lower frequency wave can be detected easier.

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