Atmospheric electricity coupling between earthquake regions and the ionosphere

Details Atmospheric electricity coupling between earthquake regions and the ionosphere Atmospheric electricity coupling between earthquake regions and the ionosphere

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..376h&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 5-6, p. 376-381.

Physics

7

Seismic Precursors, Troposphere-Ionosphere Coupling, Conduction Current Density, Radon, Global Circuit

Scientific paper

We propose a mechanism to explain suggested links between seismic activity and ionospheric changes detected overhead. Specifically, we explain changes in the natural extremely low-frequency (ELF) radio noise recently observed in the topside ionosphere aboard the DEMETER satellite at night, before major earthquakes. Our mechanism utilises increased electrical conductivity of surface layer air before a major earthquake, which reduces the surface-ionosphere electrical resistance. This increases the vertical fair weather current, and (to maintain continuity of electron flow) lowers the ionosphere. Magnitudes of crucial parameters are estimated and found to be consistent with observations. Natural variability in ionospheric and atmospheric electrical properties is evaluated, and may be overcome using a hybrid detection approach. Suggested experiments to investigate the mechanism involve measuring the cut-off frequency of ELF "tweeks", the amplitude and phase of very low frequency radio waves in the Earth-ionosphere waveguide, or medium frequency radar, incoherent scatter or rocket studies of the lower ionospheric electron density.

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