Transmission characteristic of electromagnetic wave from the earth into the air

2014 ◽  
Author(s):  
Sangmu Lee ◽  
Dongho Kim ◽  
Pyung-Dong Cho
Keyword(s):  
Electromagnetic Wave ◽  
Transmission Characteristic ◽  
The Earth

A DISCUSSION OF THE “FAULT” AND “DIKE” PROBLEMS IN MAGNETOTELLURIC THEORY

Geophysics ◽  
1963 ◽  
Vol 28 (3) ◽  
pp. 487-490 ◽  
Author(s):  
J. T. Weaver
Keyword(s):  
Boundary Condition ◽  
Electromagnetic Wave ◽  
Current Density ◽  
Normal Component ◽  
The Earth ◽  
Source Field ◽  
Vertical Fault ◽  
Explicit Mention

In two recent papers appearing in Geophysics, d’Erceville and Kunetz (1962) and Rankin (1962) have dealt with the magnetotelluric theory for a plane earth which contains a certain type of vertical fault. In both cases the results depend on a boundary condition which requires the assumption that the normal component of current density vanishes at the surface of the earth. While d’Erceville and Kunetz confine their attention to the region below the surface and thereby avoid explicit mention of the source field, Rankin follows Cagniard (1953) by considering a plane‐polarized electromagnetic wave normally incident on the surface of the earth. In this case, the assumed boundary condition is not correct, as we shall see later; indeed, it actually leads to a contradiction.

Why Newtonian gravity is an electromagnetic wave

2020 ◽  
Vol 33 (1) ◽  
pp. 23-26
Author(s):  
Nicolus Rotich
Keyword(s):  
Electromagnetic Wave ◽  
Gravitational Waves ◽  
Newtonian Gravity ◽  
Earth Surface ◽  
Speed Of Light ◽  
The Earth ◽  
Planetary Bodies ◽  
The Waves

In this brief communication, we have hypothesized that since Newtonian gravity intimately interacts with classical gravitational waves, it must also be perceivable and mathematically expressible as a wave. It has been shown that Newtonian gravity can be represented as an electromagnetic wave of a particular wavelength <mml:math display="inline"> <mml:mi>λ</mml:mi> </mml:math> , propagating at the speed of light, c and with a radius of <mml:math display="inline"> <mml:mrow> <mml:mi>z</mml:mi> <mml:mo>=</mml:mo> <mml:mi>λ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mi>π</mml:mi> </mml:mrow> </mml:math> . The waves period is given by T = c/g, and thus acceleration due to gravity is representable as g = cf, where f is position dependent, and thus unique for all orbiting planetary bodies. On the Earth surface, this value is ≅32.71 nHz.

scholarly journals Electromagnetic-wave radiation due to diastrophism of magma dike growth in Izu-Miyake volcanic eruptions in Japan in 2000

2001 ◽  
Vol 1 (1/2) ◽  
pp. 43-51 ◽  
Author(s):  
M. Hata ◽  
I. Takumi ◽  
H. Yasukawa
Keyword(s):  
Electromagnetic Wave ◽  
Magnetic Flux ◽  
Volcanic Activity ◽  
Electromagnetic Waves ◽  
Volcanic Eruptions ◽  
Wave Radiation ◽  
Gps Data ◽  
Radiation Mechanisms ◽  
The Earth ◽  
Gps Observation

Abstract. A large 10 cm per day diastrophism of the crust was experienced between Kozu and Niijima Islands during the Izu-Miyake volcanic eruptions in Japan on 3–4 August 2000. The diastrophism was detected through GPS observation. The seismometer also complied a swarm of earth-quakes at this time. Our electromagnetic wave data, observed at 223 Hz at the Omaezaki site, about 110 km and 150 km northwest of the Kozu and Miyake Islands, respectively, detected a clear, anomalous magnetic flux radiation that corresponded well with the seismographic and GPS data. Similar radiation was received for about one week preceding the big volcanic eruption that occurred on 18 August 2000. These observations indicate that the electromagnetic wave monitoring system has the potential to monitor and/or warn of volcanic activity, and the facts disclose one of the mysterious radiation mechanisms of electromagnetic waves emitted from the Earth.

scholarly journals Gravitational waves from neutron stars and asteroseismology

2018 ◽  
Vol 376 (2120) ◽  
pp. 20170285 ◽  
Author(s):  
Wynn C. G. Ho
Keyword(s):  
Electromagnetic Wave ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Massive Stars ◽  
Supernova Explosion ◽  
Wide Binary ◽  
Fundamental Physics ◽  
Atomic Nuclei ◽  
The Earth

Neutron stars are born in the supernova explosion of massive stars. Neutron stars rotate as stably as atomic clocks and possess densities exceeding that of atomic nuclei and magnetic fields millions to billions of times stronger than those created in laboratories on the Earth. The physical properties of neutron stars are determined by many areas of fundamental physics, and detection of gravitational waves can provide invaluable insights into our understanding of these areas. Here, we describe some of the physics and astrophysics of neutron stars and how traditional electromagnetic wave observations provide clues to the sorts of gravitational waves we expect from these stars. We pay particular attention to neutron star fluid oscillations, examining their impact on electromagnetic and gravitational wave observations when these stars are in a wide binary or isolated system, then during binary inspiral right before merger, and finally at times soon after merger. This article is part of a discussion meeting issue ‘The promises of gravitational-wave astronomy’.

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