Back to Search
Start Over
Similar behaviors of natural ELF/VLF ionospheric emissions and transmitter signals over seismic Adriatic regions
- 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.
- Subjects :
- 010504 meteorology & atmospheric sciences
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
[SDE.MCG]Environmental Sciences/Global Changes
0211 other engineering and technologies
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]
02 engineering and technology
01 natural sciences
Signal
lcsh:TD1-1066
Physics::Geophysics
Large earthquakes
Spectral analysis
lcsh:Environmental technology. Sanitary engineering
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment
lcsh:Environmental sciences
0105 earth and related environmental sciences
lcsh:GE1-350
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
021110 strategic, defence & security studies
lcsh:QE1-996.5
Transmitter
lcsh:Geography. Anthropology. Recreation
Geophysics
lcsh:Geology
On board
Earth's magnetic field
lcsh:G
13. Climate action
Physics::Space Physics
General Earth and Planetary Sciences
Ionosphere
Seismology
Geology
Subjects
Details
- ISSN :
- 16849981 and 15618633
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Natural Hazards and Earth System Sciences
- Accession number :
- edsair.doi.dedup.....78ff783895b83b2a35da3ba93af4e1ed