Geoelectromagnetism and geodynamics: `Corona discharge' from volcanic and geothermal areas

Details Geoelectromagnetism and geodynamics: `Corona discharge' from volcanic and geothermal areas Geoelectromagnetism and geodynamics: `Corona discharge' from volcanic and geothermal areas

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...77...39g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 77, Issue 1-2, p. 39-63.

Physics

2

Scientific paper

It is proposed that volcanic areas, geothermal areas, and even some other suitable regions are the site of a `corona discharge' effect, reflecting their short-circuiting with the electric currents responsible for the Earth's magnetic field. Such areas may have an electromagnetic coupling with the ionosphere that depends on the local amount of the corona effect. Correlations between geoelectromagnetism and geodynamics are, therefore, reconsidered and it is proposed that controversial observations of both telluric and ionospheric effects are the result of different local conditions of the various experiments. Supporting observational evidence exists, although it unavoidably still relies on some speculation which could be resolved by considering simultaneous records of geoelectromagnetic phenomena (including underground effects, and the eventual associated ionospheric coupling) within a suitable network of observing sites. Their long range (multiannual) variation ought to be correlated with the planetary trend of the secular variation of the geomagnetic field. In any case, the Earth ought to be treated as a unique and complex planetary object: geoelectromagnetic phenomena, anomalies of spin rate and pole displacements, and, whenever possible, crustal stress, appear to be the key points for working out the problem of earthquake precursors and forecasting.

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