Physics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11306306s&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A6, CiteID A06306
Physics
1
Ionosphere: Ionospheric Disturbances, Ionosphere: Ionospheric Irregularities, Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Radio Science: Waves In Plasma (7867), Radio Science: Radio Wave Propagation
Scientific paper
The coupling between the atmosphere and lower ionosphere (due to either the DC electric field or atmospheric gravity waves) may lead to the formation of horizontal irregularities of ionospheric conductivity over an earthquake preparation region. Such interaction of these irregularities with the background electromagnetic noise leads to occurrence of periodic polarization electric currents. These currents are considered to be a coherent source of gyrotropic waves propagating in the ionospheric conducting layer with finite thickness. The theoretical estimation has been performed on the generation of those ionospheric micropulsations in the frequency range of ULF to ELF in the equatorial latitude with horizontal Earth's magnetic field. Then it is found that those waves appear as a narrow-banded line spectrum in the frequency range from 1 to 30 Hz, and these waves are expected to be observed on Earth's surface.
Hayakawa Masahiko
Sorokin V. M.
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