Abstract ULF/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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    Title :

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


    Contributors:
    Zhang, X. (author) / Zeren, Z. (author) / Parrot, M. (author) / Battiston, R. (author) / Qian, J. (author) / Shen, X. (author)

    Published in:

    Advances in Space Research ; 47 , 6 ; 991-1000


    Publication date :

    2010-11-02


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English