Properties of spatial and frequency filtration of electromagnetic ULF radiation in the lithosphere–amosphere–ionosphere system

1Grimalsky, VV, 2Kremenetsky, IA, 2Cheremnykh, ОК
1National Institute of Astrophysics, Optics and Electronics, Mexico
2Space Research Institute of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Kyiv, Ukraine
Kosm. nauka tehnol. 2001, 7 ;(2-3):041-052
Section: Study of the Earth from Space
Publication Language: Russian
The propagation of electromagnitic ULF radiation from a lithosferic current source which may occur before an earthquake into satellite altitudes was calculated using the model of continuous medium with an oblique geomagnitic field and a smooth variation of ionospheric parameters. Changes in the shape of the electromagnitic radiation region during its propagation from the lithosphere into the ionosphere (the spatial filtration property) are studied. The spatial filtration is considered for different configurations of volumetric current inthe lithosphere. The amplitude-frequency characteristics defining the properties of frequency filtration of the electromagnetic ULF radia­tion in the lithosphere-atmosphere-ionosphere system are obtained for some altitudes, for the basic geophysical ionospheric conditions, and for different stratification depths of the source. The main losses of the electromagnetic ULF radiation are analysed for its propagation through he lithosphere-atmosphere-ionosphere system, and the type of the waves which can be recorded with satellites is specified. The conclusion about the possibility of recording the electromagnitic ULF radiation from a lithospheric source with satellites is made.
Keywords: lithosferic current source, lithosphere–amosphere–ionosphere system, satellite altitudes
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