| Popis: |
Based on the data of France DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite, we have made identification to the level 1 data using level 2 picture, moving median processing, analyses of latitude changes and spatial differences. We found some anomalies in the ionosphere above the epicenter of the 27 February 2010 Chile M8.8 earthquake. In an area 1500 km apart from the epicenter, electron density rose on 20 February 2010. The electron density declined on 24th. The electric, magnetic fields and some plasma parameters disturbed at the same time on 25th and 26th. Besides, on 26th, electron density of 2 orbits exceeded the background values. The electric field spectrum around the magnetic equator on 27th began to drop 4 hours before the great earthquake, and meanwhile strong perturbations of some plasma parameters occurred. |
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