THE ELECTRIC AND MAGNETIC FIELDS AT THE SURFACE OF A FLAT CONDUCTING EARTH IN THE NEAR FIELD OF AN OSCILLATING LINE CURRENT

1966 ◽  
Vol 44 (8) ◽  
pp. 1923-1931 ◽  
Author(s):  
H. W. Dosso
Keyword(s):  
Magnetic Fields ◽  
Near Field ◽  
Numerical Calculations ◽  
Line Current ◽  
The Earth ◽  
Electric And Magnetic Fields ◽  
Phase Angles

The electric and magnetic fields at the surface of a flat conducting earth in the near field of an oscillating line current are studied in this work. The equations for the amplitudes and phase angles developed by Law and Fannin (1961) were used for the numerical calculations. The source heights (h = 105 to 4 × 105 meters), the source frequencies (ƒ = 10−3 to 10 sec−1), and the earth conductivities (σ = 10−5 to 10 mho/m) considered are of interest in geophysics.

Analogue model measurements of electromagnetic variations in the near field of an oscillating line current

1968 ◽  
Vol 5 (1) ◽  
pp. 23-29 ◽  
Author(s):  
H. W. Dosso ◽  
J. A. Jacobs
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Current Model ◽  
Near Field ◽  
Analogue Model ◽  
Line Current ◽  
Earth’S Mantle ◽  
Electric And Magnetic Fields ◽  
Sheet Current ◽  
Conducting Zone

An analogue model for studying electromagnetic variations for an overhead oscillating line current is described. Measurements of electric and magnetic fields for model earth–sea interfaces are discussed and compared with results reported earlier for an overhead sheet current. A truncated cone representing a circular sea, a graphite wedge representing an ocean coastline, and a graphite wedge underlain by a graphite block representing an upwelling conducting zone in the earth's mantle near a sea coast are considered. In some cases the results for the line current model differ appreciably from those for the sheet current model, indicating that the nature of the source field can be an important factor in determining the behavior of the field components. The model measurements indicate that land–sea interfaces produce no appreciable anomalous magnetic fields at frequencies below 0.01 cps and hence the presence of the sea alone cannot account for coastal magnetic field anomalies. The results obtained for the model coastline structures tend to support the idea put forth by various workers that experimentally observed coastal magnetic field anomalies can in some cases be explained by assuming an upwelling conducting zone within the earth's mantle.

Simultaneous Measurement of Electric and Magnetic Fields With a Dual Probe for Efficient Near-Field Scanning

2019 ◽  
Vol 67 (4) ◽  
pp. 2859-2864 ◽  
Author(s):  
Weiheng Shao ◽  
Wenxiao Fang ◽  
Yun Huang ◽  
Guangwei Li ◽  
Lei Wang ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Simultaneous Measurement ◽  
Near Field ◽  
Electric And Magnetic Fields ◽  
Near Field Scanning ◽  
Dual Probe

scholarly journals Propagation of ELF Radiation from RS-LC System and Red Sprites in Earth-Ionosphere Waveguide

2012 ◽  
Vol 1 (2) ◽  
pp. 96
Author(s):  
M. K. Paras ◽  
J. Rai
Keyword(s):  
Magnetic Fields ◽  
Return Stroke ◽  
Schumann Resonances ◽  
The Earth ◽  
Electric And Magnetic Fields ◽  
Red Sprites

In this paper, two different mechanisms return stroke-lateral corona (RS-LC) system and red sprites which excite Earth-ionosphere waveguide have been discussed. The electric and magnetic fields from RS-LC system and red spites in the Earth-ionosphere waveguide have been calculated. It has been found that red sprites contribute to the Schumann resonances (SR) greatly as compared to the RS-LC system.

Infra-low-frequency gravitational wave signals in the electric and magnetic fields of the earth

2017 ◽  
Vol 61 (4) ◽  
pp. 368-375 ◽  
Author(s):  
L. V. Grunskaya ◽  
V. V. Isakevich ◽  
D. V. Isakevich ◽  
V. E. Luk’yanov ◽  
I. A. Leshchev
Keyword(s):  
Magnetic Fields ◽  
Gravitational Wave ◽  
Low Frequency ◽  
The Earth ◽  
Electric And Magnetic Fields

scholarly journals GEOPHYSICS AS A SCIENCE

Geophysics ◽  
1937 ◽  
Vol 2 (3) ◽  
pp. 185-187 ◽  
Author(s):  
B. Gutenberg
Keyword(s):  
Magnetic Fields ◽  
Structure And Properties ◽  
The Earth ◽  
Electric And Magnetic Fields

“Geophysics” means “Physics of the Earth.” While in physics one tries to eliminate the effects of the gravitational, electric, and magnetic fields of the earth, in geophysics these fields, their properties and effects, and the structure and properties of parts of the earth are studied.

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