Gravitational-to-electromagnetic wave conversion in electrostatic field of earth-ionosphere resonator

1993 ◽  
Vol 35 (6-7) ◽  
pp. 318-323 ◽  
Author(s):  
A. A. Minakov ◽  
A. P. Nikolaenko ◽  
L. M. Rabinovich
Keyword(s):  
Electromagnetic Wave ◽  
Electrostatic Field ◽  
Wave Conversion

scholarly journals Seismoelectric interface response: Experimental results and forward model

Geophysics ◽  
2011 ◽  
Vol 76 (4) ◽  
pp. N29-N36 ◽  
Author(s):  
M. D. Schakel ◽  
D. M. J. Smeulders ◽  
E. C. Slob ◽  
H. K. J. Heller
Keyword(s):  
Electromagnetic Wave ◽  
Wire Electrode ◽  
Acoustic Source ◽  
Porous Sample ◽  
Field Methods ◽  
Full Waveform ◽  
Medium Interface ◽  
Wave Conversion ◽  
Amplitude Pattern ◽  
Engineering Geophysics

Understanding the seismoelectric interface response is important for developing seismoelectric field methods for oil exploration and environmental/engineering geophysics. The existing seismoelectric theory has never been validated systematically by controlled experiments. We have designed and developed an experimental setup in which acoustic-to- electromagnetic wave conversions at interfaces are measured. An acoustic source emits a pressure wave that impinges upon a porous sample. The reflected electric-wave potential is recorded by a wire electrode. We have also developed a full-waveform electrokinetic theoretical model based on the Sommerfeld approach and have compared it with measurements at positions perpendicular and parallel to the fluid/porous-medium interface. We performed experiments at several salinities. For 10-3 and 10-2 M sodium chloride (NaCl) solutions, both waveforms and amplitudes agree. For 10-4 M NaCl, however, amplitude deviations occur. We found that a single amplitude field scaling factor describes these discrepancies. We also checked the repeatability of experiments. The amplitudes are constant for the duration of an experiment (1–4 hours) but decrease on longer time scales [Formula: see text]. However, the waveforms and spatial amplitude pattern of the electric wavefield are preserved over time. Our results validate electrokinetic theory for the seismic-to-electromagnetic-wave conversion at interfaces for subsurface exploration purposes.

Electromagnetic wave generation in a cylindrical resonator by electrons orbiting in a radial electrostatic field

1998 ◽  
Vol 43 (8) ◽  
pp. 959-962
Author(s):  
V. V. Dolgopolov ◽  
Yu. V. Kirichenko ◽  
Yu. F. Lonin ◽  
I. F. Kharchenko
Keyword(s):  
Electromagnetic Wave ◽  
Electrostatic Field ◽  
Wave Generation ◽  
Cylindrical Resonator
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