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| Titel |
Similar behaviors of natural ELF/VLF ionospheric emissions and transmitter signals over seismic Adriatic regions |
| VerfasserIn |
M. Y. Boudjada, K. Schwingenschuh, H. K. Biernat, J. J. Berthelier, J. Blecki, M. Parrot, M. Stachel, Ö. Aydogar, G. Stangl, J. Weingrill |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 6 ; Nr. 8, no. 6 (2008-11-24), S.1229-1236 |
| Datensatznummer |
250005893
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| Publikation (Nr.) |
 copernicus.org/nhess-8-1229-2008.pdf |
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| Zusammenfassung |
| We report on the analysis of ELF/VLF emissions observed by the
Instrument Champ Electrique (ICE) experiment onboard the DEMETER
micro-satellite. We consider principally selected seismic events
reported by Molchanov et al. (2006). These authors studied the VLF
signals radiated by ground transmitters and received on board the
DEMETER micro-satellite. They revealed a drop of the signals
(scattering spot) connected with the occurrence of large
earthquakes. In our investigations, we proceed to a spectral
analysis of ICE observations with the aim to find if the natural
ionospheric VLF/ELF emissions show, or not, a similar ''drop'' in the
intensity as it is the case of the VLF transmitter signal. We
combine our results with those of Molchanov et al. (2006), and we
discuss the origin of such interesting ionospheric features in the
frame of the investigation of the pre-seismic electromagnetic
emissions. We show that the geomagnetic activity is a key parameter
which could disturb the natural VLF ionospheric emissions, and also
the transmitter signal. We find that it is not possible to conclude
the presence, or not, of a preseismic effect when the Kp-index is
higher than one. |
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