A new ionospheric mechanism of electromagnetic ELF precursors to earthquakes

Details A new ionospheric mechanism of electromagnetic ELF precursors to earthquakes A new ionospheric mechanism of electromagnetic ELF precursors to earthquakes

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63....3b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 1, p. 3-10.

Physics

4

Scientific paper

Generation of whistler mode waves in the ionosphere above seismic zone is discussed. The suggested mechanism involves transformation of electromagnetic noises propagating in the subionospheric waveguide on plasma irregularities excited in the ionosphere prior to earthquakes. Such plasma irregularities have been observed by satellites prior to seismic activity. ELF electric and magnetic field perturbations in the upper ionosphere are obtained and compared with the experimental data. It is shown that the suggested mechanism is able to explain the maximum of signal intensity at the frequencies 200-500 Hz in accordance with experiments.

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