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http://dx.doi.org/10.5140/JASS.2017.34.4.251

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)
Publication Information
Journal of Astronomy and Space Sciences / v.34, no.4, 2017 , pp. 251-256 More about this Journal
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.
Keywords
earthquake; Coulomb field; ionospheric perturbation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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