Time-varying seismogenic coulomb electric fields as a probable source for pre-earthquake variation in the ionospheric F2-layer

Vitaly P. Kim, Valery V. Hegai, Jann Yenq Liu, Kwangsun Ryu, Jong Kyun Chung

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

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 ~7×105 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.

Original languageEnglish
Pages (from-to)251-256
Number of pages6
JournalJournal of Astronomy and Space Sciences
Volume34
Issue number4
DOIs
StatePublished - 1 Dec 2017

Keywords

  • Coulomb field
  • Earthquake
  • Ionospheric perturbation

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