Electric Field Amplification inside a Porous Spherical Cavity Resonator Excited by an External Plane Wave

2012 ◽  
Vol 60 (2) ◽  
pp. 832-839 ◽  
Author(s):  
Paul A. Bernhardt ◽  
Richard F. Fernsler
Keyword(s):  
Plane Wave ◽  
Electric Field ◽  
Spherical Cavity ◽  
Cavity Resonator ◽  
Field Amplification

Augmented Plane Wave Study of Electric Field Gradients in Non-cubic Metals

1990 ◽  
Vol 45 (3-4) ◽  
pp. 368-374 ◽  
Author(s):  
R. Leiberich ◽  
P. C. Schmidt ◽  
N. Sahoo ◽  
T. P. Das
Keyword(s):  
Plane Wave ◽  
Electric Field ◽  
Full Potential ◽  
Augmented Plane Wave ◽  
Cubic Metals ◽  
Field Gradients ◽  
Valence Electrons ◽  
Electron Contribution ◽  
Ionic Contribution ◽  
Beryllium Metal

Abstract The electric field gradient (EFG) in body-centered tetragonal Indium metal and hexagonal closed packed Beryllium metal is calculated on the basis of a full potential scalar relativistic augmented plane wave procedure. The various contributions to the EFG in simple metals are discussed. The total EFG in In metal found theoretically is equal to qtheor = 2.67 x 1021 Vm-2 . This value agrees well with the experimental data. Using the quadrupole moment Q deduced from the hyperfine splitting of the muon X-ray spectra one gets g exp = 2.46 x 1021 Vm-2 . The valence electrons of Indium give a direct contribution of qel = 2.72 x 1021 Vm-2 , whereas the direct ionic contribution q ion is much smaller and has opposite sign: qion = -0.01 x 1021 Vm-2 . There is a small net shielding contribution of qsh = -0.03 x 1021 Vm-2 to the EFG composed of the ionic contribution gsh. ion = -0.39 x 1021 Vm- 2 and the valence electron contribution qsh,ve = 0.36 x 10 21 Vm-2 .

On modeling airborne very low‐frequency measurements

Geophysics ◽  
1989 ◽  
Vol 54 (12) ◽  
pp. 1596-1606 ◽  
Author(s):  
Ari Poikonen ◽  
Ilkka Suppala
Keyword(s):  
Plane Wave ◽  
Electric Field ◽  
Numerical Models ◽  
Vertical Component ◽  
Low Frequency ◽  
Primary Field ◽  
Vertical Electric Field ◽  
Inhomogeneous Plane ◽  
Inhomogeneous Plane Wave ◽  
Attenuation Characteristics

Numerical models employed in ground VLF modeling use a normally incident (homogeneous) plane wave as a primary field. We show that these models are not directly applicable to modeling the impedance and wavetilt in the air, quantities needed in the interpretation of airborne VLF resistivity measurements. Instead, the primary field must be replaced by an inhomogeneous plane wave incident on the ground at an angle close to 90 degrees in order to provide the correct behavior of the apparent resistivities in the air. VLF magnetic polarization parameters, however, can be modeled in the air using the normally incident plane wave as a primary field. We also show that the plane‐wave analysis provides the same attenuation characteristics for the wavetilt in the air that is predicted by the Norton’s surface wave obtained by using the vertical electric dipole as a source. Use of the inhomogeneous plane wave introduces the vertical component of the electric field in the model. A 2‐D modeling technique based on the network solution is used to demonstrate the effects of the vertical electric field in the H‐polarization case. The vertical electric field generates charge distributions on the horizontal boundaries of conductors. In the case of a vertical sheet‐like conductor, these charges cause a slight asymmetry in apparent‐resistivity anomalies. Attenuation characteristics of various VLF anomalies with altitude are also presented. The H‐polarization anomalies attenuate much more rapidly in the air than those for E‐polarization due to the difference in the dominating source of EM fields in each polarization.

Transverse effects and noise in optical instabilities

1984 ◽  
Vol 313 (1525) ◽  
pp. 291-297 ◽  
Keyword(s):  
Plane Wave ◽  
Electric Field ◽  
Opposite Sign ◽  
Ring Cavity ◽  
Wave Theory ◽  
Radial Variation ◽  
Bistable System ◽  
Primary Role ◽  
Favourable Situation ◽  
Oscillatory Instabilities

We analyse the simplest model that describes the dynamics of a two-level, optically bistable system in a ring cavity, and incorporates a Gaussian radial variation of the electric field. We find that the most favourable situation to achieve self-pulsing instabilities is that of atomic and cavity detunings with opposite sign. The results are compared with those of plane-wave theory. We show that noise plays a primary role at the onset of self-oscillatory instabilities, and that its effects are governed by an equation formally identical to the Risken equation for the laser.

scholarly journals DC electric field amplification in the mid-latitude ionosphere over seismically active faults

2006 ◽  
Vol 31 (4-9) ◽  
pp. 447-453 ◽  
Author(s):  
V.M. Sorokin ◽  
A.K. Yaschenko ◽  
V.M. Chmyrev ◽  
M. Hayakawa
Keyword(s):  
Electric Field ◽  
Active Faults ◽  
Field Amplification ◽  
Dc Electric Field
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