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Similar behaviors of natural ELF/VLF ionospheric emissions and transmitter signals over seismic Adriatic regions

Authors :
Ö. Aydogar
Mohammed Y. Boudjada
J. Weingrill
Jan Blecki
G. Stangl
Konrad Schwingenschuh
H. K. Biernat
Manfred Stachel
Michel Parrot
Jean-Jacques Berthelier
Space Research Institute of Austrian Academy of Sciences (IWF)
Austrian Academy of Sciences (OeAW)
Department of Theoretical Physics [Graz]
Institute of Physics [Graz]
Karl-Franzens-Universität [Graz, Autriche]-Karl-Franzens-Universität [Graz, Autriche]
Centre d'étude des environnements terrestre et planétaires (CETP)
Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Space Research Centre of Polish Academy of Sciences (CBK)
Polska Akademia Nauk = Polish Academy of Sciences (PAN)
Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E)
Observatoire des Sciences de l'Univers en région Centre (OSUC)
Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National d’Études Spatiales [Paris] (CNES)
Austrian Federal Office for Metrology and Surveying (BEV)
Austrian Federal Ministry of Economics and Labour
Source :
Natural Hazards and Earth System Sciences, Natural Hazards and Earth System Sciences, Copernicus Publ. / European Geosciences Union, 2008, 8 (6), pp.1229-1236. ⟨10.5194/nhess-8-1229-2008⟩, Natural Hazards and Earth System Sciences, Vol 8, Iss 6, Pp 1229-1236 (2008), NASA Astrophysics Data System
Publication Year :
2008
Publisher :
Copernicus GmbH, 2008.

Abstract

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.

Details

ISSN :
16849981 and 15618633
Volume :
8
Database :
OpenAIRE
Journal :
Natural Hazards and Earth System Sciences
Accession number :
edsair.doi.dedup.....78ff783895b83b2a35da3ba93af4e1ed
Full Text :
https://doi.org/10.5194/nhess-8-1229-2008