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.

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.

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

ELECTROMAGNETIC FIELDS OF A TRANSIENT MAGNETIC DIPOLE ON THE EARTH’S SURFACE

Geophysics ◽  
1959 ◽  
Vol 24 (1) ◽  
pp. 89-108 ◽  
Author(s):  
Bimal Krishna Bhattacharyya
Keyword(s):  
Magnetic Fields ◽  
Step Function ◽  
Displacement Current ◽  
Time Interval ◽  
Initial Amplitude ◽  
Impedance Function ◽  
Circular Loop ◽  
Mutual Impedance ◽  
The Earth ◽  
Electric And Magnetic Fields

Transient electric and magnetic fields close to the surface of the earth, as developed by a step‐function current flowing in a circular loop of wire, have been determined. The effect of the insulating air region is fully taken into account. It is observed that the air region has an appreciable influence on the fields over the surface of the earth. The effect of displacement current within the earth has also been considered. Expressions of electric and magnetic fields have been utilized to determine (a) the mutual impedance function between the primary loop and a small length of wire and (b) the voltage induced in a secondary loop. Both these functions are found to have appreciable magnitudes only during the time interval between the arrival of the wave travelling through air and that of the wave via the conducting medium. From a study of this duration and the initial amplitude of either of the two functions, it is possible to obtain values of conductivity and permittivity of the earth. Curves have been plotted to depict the nature of variation of these functions with time for different values of the electric constants of the earth.

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