Abstract
Ionospheric data obtained from the DORIS system are used in this paper. The DORIS system is composed of several ground-based beacons which emit at two frequencies (400 MHz and 2 GHz) and of receivers on board several satellites (currently SPOT2, SPOT4, SPOT5, Topex-Poseidon, Jason1 and Envisat). Thanks to the density of its network coverage (?50 stations), DORIS provides information on the ionosphere. The TEC (Total Electron Content) parameter which is the electron density integrated over the vertical could be obtained from DORIS measurements. In a first step, the paper describes the way to obtain the TEC data from the DORIS ionospheric measurements, and comparisons of the results are done with the IRI2001 model. In a second step, TEC values are used to search for correlation between ionospheric perturbations and seismic activity. Earthquakes of magnitude larger than 5 are chosen close to the ground-based DORIS stations. Among other results, the statistics show that, during the night time and at geomagnetic latitude close to the equator (<10°), TEC amplitude fluctuates at the time of the earthquakes as it is expected, but also 2 days and 5 days before.
Highlights
The aim of this paper is to perform a statistical analysis of the variations of an ionospheric parameter called TEC (Total Electron Content) in relation to seismic activity in order to reveal a seismo-electromagnetic effect
Its existence has been underlined since the 50s and this phenomenon is very interesting because for certain cases, it occurs before the earthquakes and can be considered a precursor
Pulinets concludes that seismo-ionospheric effects observed at all heights of the atmosphere-thermosphere-ionosphere-magnetosphere chain is a kind of electromagnetic coupling due to large-scale anomalous electric field appearing over the seismoactive area several days before strong earthquakes
Summary
The aim of this paper is to perform a statistical analysis of the variations of an ionospheric parameter called TEC (Total Electron Content) in relation to seismic activity in order to reveal a seismo-electromagnetic effect. Pulinets concludes that seismo-ionospheric effects observed at all heights of the atmosphere-thermosphere-ionosphere-magnetosphere chain is a kind of electromagnetic coupling due to large-scale anomalous electric field appearing over the seismoactive area several days before strong earthquakes. He considers this process like plasma-chemistry processes and ion-molecular reactions over the ground surface in seismo-active zones, regardless of the physical mechanism of the large scale electric field, it produces no effects within the ionosphere.
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