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R. Smith

Bio: R. Smith is an academic researcher from University of Leicester. The author has contributed to research in topics: Waveguide & Earth–ionosphere waveguide. The author has an hindex of 2, co-authored 2 publications receiving 17 citations.

Papers
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Journal ArticleDOI
R. Smith1
TL;DR: In this paper, the authors investigated land-sea propagation at VLF frequencies for an Earth-ionosphere waveguide bounded above by an anisotropic, horizontally stratified ionosphere.

11 citations

Journal ArticleDOI
R. Smith1
TL;DR: In this paper, the Earth-ionosphere waveguide is considered to be a parallel plate waveguide whose upper and lower boundaries are characterized by constant impedance matrices, and simple orthogonal relations between the resulting modes are found and used to obtain an approximate formula for the mode conversion coefficients at a land-sea discontinuity.

6 citations


Cited by
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Journal ArticleDOI
TL;DR: A review of developments in ELF and VLF radio-wave propagation research over the last 50 years of the Journal of Atmospheric and Solar-Terrestrial Physics can be found in this paper.

251 citations

Journal ArticleDOI
TL;DR: In this article, a mathematical model, an asymptotic theory and an appropriate numerical algorithm were presented to study the scalar approximation of the VLF point source field propagation problem within the non-uniform Earth ionosphere waveguide.
Abstract: This paper presents a mathematical model, an asymptotic theory and an appropriate numerical algorithm to study, in the scalar approximation, VLF point source field propagation problem within the non-uniform Earth-ionosphere waveguide. We have taken into account a 3D local ionospheric inhomogeneity over the ground of the solar terminator transition. The local ionospheric perturbation whose centre is situated above the model earthquake, is simulated by a bell-shaped impedance inhomogeneity of the ionospheric waveguide wall. The ionosphere model parameters are computed with allowing for the geomagnetic field. Our numerical results show that the inclusion of the local ionospheric inhomogeneity in the radio wave propagation across the solar terminator path deforms the diurnal variations of field amplitude and phase in accordance with the observational data.

23 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that the fields constituting the waveguide modes reflected from natural discontinuities in the lower boundary of the earth-ionosphere waveguide have a negligible amplitude compared to the fields constituted by the incident modes at VLF (Kirchoff's approximation).

13 citations

Journal ArticleDOI
R. Smith1
TL;DR: In this paper, the authors investigated land-sea propagation at VLF frequencies for an Earth-ionosphere waveguide bounded above by an anisotropic, horizontally stratified ionosphere.

11 citations

Posted Content
TL;DR: In this article, the authors theoretically predict the normal characteristics of very low frequency (3~30 kHz) radio wave propagation through Earth-ionosphere waveguide corresponding to normal behavior of the D-region ionosphere.
Abstract: In this thesis, we theoretically predict the normal characteristics of Very Low Frequency (3~30 kHz) radio wave propagation through Earth-ionosphere waveguide corresponding to normal behavior of the D-region ionosphere. We took the VLF narrow band data from the receivers of Indian Centre for Space Physics (ICSP) to validate our models. Detection of sudden ionospheric disturbances (SIDs) are common to all the measurements. We apply our theoretical models to infer the D-region characteristics and to reproduce the observed VLF signal behavior corresponding to such SIDs. We develop a code based on ray theory to simulate the diurnal behavior of VLF signals over short propagation paths (2000~3000 km). The diurnal variation from this code are comparable to the variation obtained from a more general Long Wave Propagation Capability (LWPC) code which is based on mode theory approach. We simulate the observational results obtained during the Total Solar Eclipse of July 22, 2009 in India. We also report and simulate a historic event, namely, the lunar occultation of a solar flare during the annular solar eclipse of 15th January, 2010 and find the effects on the D-region electron density profiles.

9 citations