Small-scale plasma inhomogeneities and correlated ELF emissions in the ionosphere over an earthquake region

Details Small-scale plasma inhomogeneities and correlated ELF emissions in the ionosphere over an earthquake region Small-scale plasma inhomogeneities and correlated ELF emissions in the ionosphere over an earthquake region

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59..967c&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 967-974.

Physics

20

Scientific paper

Cosmos-1809 satellite data on ELF emissions, plasma density, Ne and variations dNe in the ionosphere above the Spitak earthquake zone during a period of enhanced aftershock activity are presented. The data show that small-scale plasma inhomogeneities with dNe/Ne ~3-8% and with a characteristic scale of 4-10 km along the orbit are excited on geomagnetic field tubes connected to the epicentral region, simultaneously with earthquake related ELF emissions. A generation mechanism for such inhomogeneities under the influence of seismic activity in terms of the dissipative instability of acoustic-gravity waves in the ionosphere is proposed.

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