Author: James R. Wait
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 104
Book Description
The principal results of this technical note are graphical presentations of the attenuation rates, phase velocities, and excitation factors for the dominant modes in the earth-ionosphere waveguide.The frequency range considered is 8 kc/s to 30 kc/s. *The model adopted for the ionosphere has an exponential variation for both the electron density and the collision frequency, and the effect of the earth's magnetic field is considered.Comparison with published experimental data confirms that the minimum attenuation of VLF radio waves in daytime is approximtely at 18 kc/s, while at night it is somewhat lower.The directional dependences of propagation predicted by the theory are also confirmed by experimental data.(Author).
Characteristics of the Earth-ionosphere Waveguide for VLF Radio Waves
Author: James R. Wait
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 104
Book Description
The principal results of this technical note are graphical presentations of the attenuation rates, phase velocities, and excitation factors for the dominant modes in the earth-ionosphere waveguide.The frequency range considered is 8 kc/s to 30 kc/s. *The model adopted for the ionosphere has an exponential variation for both the electron density and the collision frequency, and the effect of the earth's magnetic field is considered.Comparison with published experimental data confirms that the minimum attenuation of VLF radio waves in daytime is approximtely at 18 kc/s, while at night it is somewhat lower.The directional dependences of propagation predicted by the theory are also confirmed by experimental data.(Author).
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 104
Book Description
The principal results of this technical note are graphical presentations of the attenuation rates, phase velocities, and excitation factors for the dominant modes in the earth-ionosphere waveguide.The frequency range considered is 8 kc/s to 30 kc/s. *The model adopted for the ionosphere has an exponential variation for both the electron density and the collision frequency, and the effect of the earth's magnetic field is considered.Comparison with published experimental data confirms that the minimum attenuation of VLF radio waves in daytime is approximtely at 18 kc/s, while at night it is somewhat lower.The directional dependences of propagation predicted by the theory are also confirmed by experimental data.(Author).
Characteristics of the Earth-Ionosphere Waveguide for VLF Radio Waves, etc
Author: James Richard WAIT (and SPIES (K. P.))
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Characteristics of the Earth-Ionosphere Waveguide for Vlf Radio Waves (Classic Reprint)
Author: James R. Wait
Publisher: Forgotten Books
ISBN: 9781396642487
Category : Science
Languages : en
Pages : 102
Book Description
Excerpt from Characteristics of the Earth-Ionosphere Waveguide for Vlf Radio Waves Propagation of vlf radio waves to very great distances is made possible by the high reflectivity of the lower ionosphe re at oblique incidence. The latter is due to the relatively sharp gradient of the electron density in the D-region of the ionosphe re. In fact, for many purposes, the assumption of an abrupt lower edge of the ionized region has permitted an analytical approach to the problem, which has produced useful results. In the main, these are confirmed experimentally. However, a number of systematic discrepancies have been observed which suggest that the sharply bounded model is not entirely adequate. In recent years, evidence from a number of independent experi mental approaches has indicated that the profile of the electron density in the undisturbed lower iono Sphere can be approximately described by an exponential function of height. Some of this evidence is indicated briefly below. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Publisher: Forgotten Books
ISBN: 9781396642487
Category : Science
Languages : en
Pages : 102
Book Description
Excerpt from Characteristics of the Earth-Ionosphere Waveguide for Vlf Radio Waves Propagation of vlf radio waves to very great distances is made possible by the high reflectivity of the lower ionosphe re at oblique incidence. The latter is due to the relatively sharp gradient of the electron density in the D-region of the ionosphe re. In fact, for many purposes, the assumption of an abrupt lower edge of the ionized region has permitted an analytical approach to the problem, which has produced useful results. In the main, these are confirmed experimentally. However, a number of systematic discrepancies have been observed which suggest that the sharply bounded model is not entirely adequate. In recent years, evidence from a number of independent experi mental approaches has indicated that the profile of the electron density in the undisturbed lower iono Sphere can be approximately described by an exponential function of height. Some of this evidence is indicated briefly below. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Propagation Characteristics of VLF Waves Below a Stratified and Generally Anisotropic Ionosphere
Author: David W. Pidwell
Publisher:
ISBN:
Category : VLF radio wave propagation
Languages : en
Pages : 87
Book Description
The research constitutes one method of formulation for the calculation of very low frequency radio wave propagation characteristics of the earth-ionosphere waveguide. It involves a brief consideration of some general properties of the ionosphere which influence the propagation of VLF (very low frequencies) waves. In the analysis, the waveguide is the area formed by the earth and the lower conducting region of the ionosphere. The propagation characteristics are obtained from the solution of a modal equation which is formulated directly in terms of the reflection coefficients of both the ionosphere and earth. The coupled vacuum mode theory of Poeverlein is extended to include the earth's curvature effects by assuming the ionosphere as a cylindrical stratified medium. The modal equation is solved by an iterative procedure and propagation characteristics are obtained for a variety of ionospheric conditions for different directions of propagation. A comparison of the numerical results is made with different formulations in the literature. (Author).
Publisher:
ISBN:
Category : VLF radio wave propagation
Languages : en
Pages : 87
Book Description
The research constitutes one method of formulation for the calculation of very low frequency radio wave propagation characteristics of the earth-ionosphere waveguide. It involves a brief consideration of some general properties of the ionosphere which influence the propagation of VLF (very low frequencies) waves. In the analysis, the waveguide is the area formed by the earth and the lower conducting region of the ionosphere. The propagation characteristics are obtained from the solution of a modal equation which is formulated directly in terms of the reflection coefficients of both the ionosphere and earth. The coupled vacuum mode theory of Poeverlein is extended to include the earth's curvature effects by assuming the ionosphere as a cylindrical stratified medium. The modal equation is solved by an iterative procedure and propagation characteristics are obtained for a variety of ionospheric conditions for different directions of propagation. A comparison of the numerical results is made with different formulations in the literature. (Author).
Mode Calculations for VLF Propagation in the Earth-ionosphere Waveguide
Author: Kenneth P. Spies
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 108
Book Description
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 108
Book Description
Characteristics of the Earth-iconosphere
VLF Mode Calculations for Propagation Across a Land/sea Boundary in the Earth-ionosphere Waveguide
Author: James R. Wait
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 40
Book Description
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 40
Book Description
Natural VLF Radio Waves
Author: Toshimi Okada
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 192
Book Description
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 192
Book Description
Transfer Characteristics of Radio Waves Propagated Between the Ionosphere and the Earth at Very Low Frequencies
Author: J. Ralph Johler
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 206
Book Description
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 206
Book Description
A Survey and Bibliography of Recent Research in the Propagation of VLF Radio Waves
Author: James R. Wait
Publisher:
ISBN:
Category : Radio wave propagation
Languages : en
Pages : 56
Book Description
Publisher:
ISBN:
Category : Radio wave propagation
Languages : en
Pages : 56
Book Description