Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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Time-Varying Seismogenic Coulomb Electric Fields as a Probable Source for Pre-Earthquake Variation in the Ionospheric F2-Layer

  • Kim, Vitaly P. (Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Russian Academy of Sciences (IZMIRAN)) ;
  • Hegai, Valery V. (Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Russian Academy of Sciences (IZMIRAN)) ;
  • Liu, Jann Yenq (Institute of Space Science, National Central University) ;
  • Ryu, Kwangsun (Satellite Technology Research Center, Korea Advanced Institute of Science and Technology) ;
  • Chung, Jong-Kyun (Korea Astronomy & Space Science Institute)
  • Received : 2017.09.25
  • Accepted : 2017.11.29
  • Published : 2017.12.15
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Abstract

The electric coupling between the lithosphere and the ionosphere is examined. The electric field is considered as a timevarying irregular vertical Coulomb field presumably produced on the Earth's surface before an earthquake within its epicentral zone by some micro-processes in the lithosphere. It is shown that the Fourier component of this electric field with a frequency of 500 Hz and a horizontal scale-size of 100 km produces in the nighttime ionosphere of high and middle latitudes a transverse electric field with a magnitude of ~20 mV/m if the peak value of the amplitude of this Fourier component is just 30 V/m. The time-varying vertical Coulomb field with a frequency of 500 Hz penetrates from the ground into the ionosphere by a factor of ${\sim}7{\times}10^5$ more efficient than a time independent vertical electrostatic field of the same scale size. The transverse electric field with amplitude of 20 mV/m will cause perturbations in the nighttime F region electron density through heating the F region plasma resulting in a reduction of the downward plasma flux from the protonosphere and an excitation of acoustic gravity waves.

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References

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