Results 181 to 190 of about 4,199 (222)

Predicting Global Ground Geoelectric Field With Coupled Geospace and Three‐Dimensional Geomagnetic Induction Models

Space Weather, 2018
We forecast the global effects of space weather on the geoelectric and geomagnetic fields using a novel combination of methods. We use a realistic three-dimensional (3-D) model of Earth's electrical conductivity and a realistic representation of ...
I Honkonen, Alexey Kuvshinov, L Rastatter   +2 more
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Extraction and selection of geoelectrical data features

2009 16th International Conference on Digital Signal Processing, 2009
Extraction and selection of proper signal characteristics is a significant step affecting the success of any subsequent data analysis. We describe a process used to extract features from a 6-year, single-channel Long Term Geoelectric Potential difference (LTGP) signal, recorded in 1998–2003 at Western Greece.
Apostolos Ifantis, Vasilis N. Nikolaidis
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The natural geoelectric field

Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269), 2002
Our planet is enveloped by an electric field, which is always present, but varies in magnitude. Even though this has been known for several decades, very little attention is being given to this phenomenon. This global electric field is still not fully understood and provides more questions than answers.
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ANALYSIS OF CORRELATION PROPERTIES IN GEOELECTRICAL DATA

Fractals, 2003
This paper considers four geoelectrical time series, measured in a seismic area of Southern Italy. Lomb Periodogram method, Higuchi analysis, Detrended Fluctuation Analysis (DFA) and the mean distance spanned within time L are used to discuss the correlation properties of these signals.
Colangelo G, Lapenna V, Telesca L
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Experiences of 2-D Geoelectrical Imaging

1st EEGS Meeting, 1995
Over the past three years we have carried out several two-dimensional (2-D) electrical imaging in order to verify the reliability of this technology in different environmental and geological conditions. The 2-D resistivity imaging method is in wide use and successfully employed for detecting pollutants diffusion, in groundwater monitoring, in buried ...
CHIARA P, GODIO, Alberto, SOCCO, LAURA, ZERILLI A.   +3 more
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Geoelectric Discontinuity Detector

1973 IEEE G-MTT International Microwave Symposium, 1973
It is sometimes necessary to quickly localize a mine bed within an accuracy of a few cm. in depth. Such high accuracy measurements are made by chemical or physiochemical methods. These methods have the disadvantage of requiring a few hours of time due to the necessity of measuring the metallic content of the ore in the laboratory rather than in situ ...
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Geoelectric Models of Kamchatka Active Volcanic Regions According to the Near-surface Geoelectric

Proceedings, 2014
Основной целью работы было определение структуры и путей миграции высокоминерализованных растворов в приповерхностном пространстве термальных полей Мутновского вулкана (Камчатка, Россия).
S.P. Bortnikova, I.N. Yeltsov, A.N. Faguet, D.I. Fadeev   +3 more
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GEOELECTRICAL PROSPECTING WITH UNDERGROUNDELECTRODES*

Geophysical Prospecting, 1962
AbstractIn many situations, because of the great influence of a surface layer on apparent resistivity values, the interpretation of electrical soundings may be very indeterminate, according to the “equivalence principle”.For these situations, an arrangement which includes an underground electrode has been proposed.
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Examples of geoelectric surveys

Proceedings of the IEE Part A: Power Engineering, 1959
The Introduction deals briefly with the general principles underlying geoelectric methods of surveying and gives a simple formula for the apparent resistivity at a given depth below the surface in a homogeneous medium. The two problems of interpreting the different kinds of curves obtained from field measurements and of determining the depth of the ...
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Hydromagnetic diagnostics and geoelectric sounding

Uspekhi Fizicheskih Nauk, 1989
A review is made of research on geomagnetic pulsations, which are hydromagnetic waves of natural origin in the frequency range 10−3–5 Hz. Methods for diagnostics of the earth's magnetosphere and methods for electromagnetic sounding of the earth's crust on the basis of data from the observation of pulsations are described.
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