Penetration characteristics of electromagnetic emissions from an underground seismic source into the atmosphere, ionosphere, and magnetosphere

Details Penetration characteristics of electromagnetic emissions from an underground seismic source into the atmosphere, ionosphere, and magnetosphere Penetration characteristics of electromagnetic emissions from an underground seismic source into the atmosphere, ionosphere, and magnetosphere

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.1691m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A2, p. 1691-1712

Statistics

Computation

42

Earth Ionosphere, Earthquakes, Electromagnetic Fields, Electromagnetic Radiation, Magnetohydrodynamic Waves, Magnetosheath, Seismic Waves, Anisotropy, Electrical Resistivity, Extremely Low Frequencies, Spatial Distribution

Scientific paper

Theoretical calculations are made on electromagnetic fields in the frequency range 10(exp -2) to 10(exp 2) Hz on the ground surface and above the ionosphere induced by stochastic microcurrent activity inside the future seismic sources on the assumption of cylindrical symmetry of the effective current and three types of polarization. The inhomogeneity of the ground and atmosphere conductivity and anisotropy of the ionosphere are taken into consideration. The intensity of ULF magnetic and electric precursors observed on the ground, and their spatial distribution can be explained by using the results of the present computations. It is found that only the fields from a magnetic type source can penetrate into the magnetosphere and generate propagating Alfven waves. The expected values of magnetospheric electric and magnetic field are 1-10 microV/m/square root of Hz and 1-10 pT/square root of Hz respectively, and the horizontal scale of their distribution is about 100-200 km. Finally, these theoretical predictions are compared with the corresponding results of satellite observations.

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