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ULF/ELF ionospheric electric field and plasma perturbations related to Chile earthquakes

Abstract : LF/ELF electric field perturbations in the ionosphere have been widely observed by the satellites. In this paper, we develop a method of Logarithm Electric Field Intensity (LEFI) to automatically distinguish this kind of disturbances based on the spectrum intensity and its damping exponent with frequency in electromagnetic signals. This method is applied to DEMETER data processing around Chile earthquakes with magnitude larger than 6.0. It is found that 2/3 earthquakes have shown obvious ULF/ELF electric field perturbations in this region. The temporal and spatial distributions of electron density and temperature were compared with that of electric field, which proved the existence of irregularities above epicentral area. Finally, the coupling mechanism of earthquake-ionosphere is discussed based on multi-parameter analysis
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https://hal-insu.archives-ouvertes.fr/insu-01310956
Contributor : Nathalie Rouchon <>
Submitted on : Tuesday, May 3, 2016 - 2:22:12 PM
Last modification on : Saturday, September 19, 2020 - 3:34:39 AM

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X. Zhang, Z. Zeren, Michel Parrot, R. Battiston, J. Qian, et al.. ULF/ELF ionospheric electric field and plasma perturbations related to Chile earthquakes. Advances in Space Research, Elsevier, 2011, 47 (6), pp.991-1000. ⟨10.1016/j.asr.2010.11.001⟩. ⟨insu-01310956⟩

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