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| Titel |
The numerical simulation on ionospheric perturbations in electric field before large earthquakes |
| VerfasserIn |
S. F. Zhao, X. M. Zhang, Z. Y. Zhao, X. H. Shen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 12 ; Nr. 32, no. 12 (2014-12-09), S.1487-1493 |
| Datensatznummer |
250121138
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| Publikation (Nr.) |
 copernicus.org/angeo-32-1487-2014.pdf |
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| Zusammenfassung |
| 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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