Finite-difference time-domain solution of Maxwell's equations for the dispersive ionosphere

Nickisch, L. J.; Franke, P. M.

doi:10.1109/74.163808

Cited by 75 publications

(50 citation statements)

References 9 publications

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“…Thus, a negative space charge forms ahead of the shock and a positive space charge forms behind it as in Figure 1. Although Adamovich et al [2] found that the kinetic energy inherent in an EDL effect was insufficient to create the observed effects, Saeks and Kunhardt [16] point out that their analysis didn't account for the Coulomb forces in the EDL. Accounting for the Coulomb forces may explain the observed shock standoff distance increase.…”

Section: Edl Modellmentioning

confidence: 99%

“…Saeks and Kunhardt [16] posit the existence of an EDL at the shock surface itself. They cite experimental work by Mishin [15] that shows an increase in electron density and conductivity ahead of the shock front and a similar decrease behind the shock front.…”

Section: Edl Modellmentioning

confidence: 99%

“…Several recent papers and presentations [1][2][3][4]14,16,22] have addressed the notion of the electronic double layer (EDL) and its candidacy as a possible mechanism for the "anomalous" phenomena. Simply stated, an EDL is a region of positive space charge layered next to a region of negative space charge in a plasma that gives rise to localized electric fields.…”

Section: Electrodynamic Effects and The Electronic Double Layermentioning

confidence: 99%

“…However, support for possible non-thermal contributions continues to mount [4][5][6][7][8][9][10]12,[14][15][16][17][18][19]]. …”

Section: Doubts On Purely Thermal Modelsmentioning

confidence: 99%

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Summer Research Program - 1998 Graduate Student Research Program. Volume 10, Wright Laboratory

Moore¹

1998

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Section: Edl Modellmentioning

confidence: 99%

Section: Edl Modellmentioning

confidence: 99%

Section: Electrodynamic Effects and The Electronic Double Layermentioning

confidence: 99%

“…However, support for possible non-thermal contributions continues to mount [4][5][6][7][8][9][10]12,[14][15][16][17][18][19]]. …”

Section: Doubts On Purely Thermal Modelsmentioning

confidence: 99%

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Summer Research Program - 1998 Graduate Student Research Program. Volume 10, Wright Laboratory

Moore¹

1998

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“…The medium of concern here is the structured ionospheric plasma. Because this plasma is a frequency-dependent (dispersive) dielectric medium, it is necessary to extend the usual FDTD methodology, and this was done by Nickisch and Franke [1992]. The method has been Copyright 2001 by the American Geophysical Union.…”

Section: Introductionmentioning

confidence: 99%

Finite difference time domain tests of random media propagation theory: 2. Signal correlation length and channel bandwidth

Nickisch¹,

Franke²

2001

Radio Science

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Abstract. The finite difference time domain method (FDTD) has been extended for application to frequency-dependent (dispersive) media such as the ionospheric plasma.This formulation of FDTD can be applied to the study of electromagnetic propagation in the plasma of the ionosphere. In the current work, we consider propagation in randomly structured ionization. The results of numerical FDTD computations of HF fields propagated through realizations of ionospheric structure are compared to the predictions of the standard random media propagation theory, which is based on the parabolic wave equation. The motivation for this study is to expose the way in which the approximate theory breaks down when applied outside of its regime of strict applicability. An earlier published analysis by the authors was limited to spatial signal decorrelation as expressed in oeo, the signal correlation length. In the current work, this spatial decorrelation analysis is supplemented with a similar analysis of signal frequency decorrelation (or delay spread) as expressed in fo, the channel bandwidth. We find that the standard propagation theory for the calculation of fo predicts larger values than those produced in the FDTD computation. This appears to be due to a polarization coupling effect that is ignored in the standard propagation theory. FDTD-computed correlation lengths are found to be in substantial agreement with the propagation theory at higher frequencies. Agreement degrades in a graceful and understandable way at lower frequencies where the limitations of the approximations used in the theory are violated.

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Analysis of a plasma‐column antenna using FDTD method

Lee

Ganguly

2005

Micro & Optical Tech Letters

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This paper presents numerical analyses of a plasma-column antenna using the finite-difference time-domain (FDTD) technique. We have simulated simple plasma-antenna configurations (monopoles) to demonstrate some of their properties. We have evaluated the field distribution around the plasma antenna, current distribution along the plasma column, radiated power, antenna pattern, and antenna impedance of the plasma column antenna. It has been demonstrated that the plasma antenna can operate with characteristics similar to a copper antenna. Furthermore, the alteration of the plasma properties enables the dynamic reconfiguration of the plasma antenna. ABSTRACT: This paper investigates a wire-grid model for the scattering analysis of bodies using the method of moments (MoM). The accuracy of the model is explored in terms of basis functions, and the size and radius of the segments of the model are determined through a defined error function. The numerical simulations indicate that the wiregrid model can accurately calculate the scattering problems when the proper model and the triangular basis function in the MoM are used.The optimal radius of the segments in the model is determined. However, the MoM with the sinusoidal basis function used in NEC2 results in very high error if both large size and large radius are adopted for the segments.

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Finite-difference time-domain solution of Maxwell's equations for the dispersive ionosphere

Cited by 75 publications

References 9 publications

Summer Research Program - 1998 Graduate Student Research Program. Volume 10, Wright Laboratory

Summer Research Program - 1998 Graduate Student Research Program. Volume 10, Wright Laboratory

Finite difference time domain tests of random media propagation theory: 2. Signal correlation length and channel bandwidth

Analysis of a plasma‐column antenna using FDTD method

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