Download or read book Mode Conversion in Earth ionosphere Waveguide with List of References written by and published by . This book was released on 1962 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mode Conversion in the Earth ionosphere Waveguide written by James R. Wait and published by . This book was released on 1962 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: An approximate theory for conversion of modes in an earth-ionosphere waveguide is propounded.The model is two concentric spherical reflecting boundaries which have prescribed surface impedances.The localized irregularity at either the ground or the ionosphere is idealized by a 'black screen' which effectively blocks the cross-section of the waveguide over a portion of its area.In this sense, the method is a union of approximate Kirchoff diffraction theory and rigorous mode theory.(Author).
Download or read book Mode Conversion in the Earth ionosphere Waveguide written by James R. Wait and published by . This book was released on 1962 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mode Conversion in the Earth ionosphere Waveguide NBS Technical Note 151 written by James R Wait and published by Hassell Street Press. This book was released on 2021-09-10 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Mode Conversion and Single Mode Excitation in the Earth Ionosphere Waveguide with Arbitrary Terrestrial Magnetic Field written by Ernst Ledinegg and published by . This book was released on 1975 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present Final Report contains the continuation and extension of investigations on the propagation of electromagnetic VLF waves in polar regions. The extension considered in this report concerns mainly the terrestrial magnetic field. Part I is devoted to general theoretical considerations. It deals with the derivation of a fictitious surface impedance of the plane ionospheric boundary which mimics the influence of the ionosphere on wave propagation through the atmosphere. In Part II the surface impedance derived in Part I is applied to two waveguide models, the plane two-dimensional and the cylindrical model. In Part III the possibilities for suppressing or favouring the excitation of certain modes in the earth-ionosphere waveguide by a suitable antenna array are discussed.
Download or read book Characteristics of the Earth ionosphere Waveguide for VLF Radio Waves written by James R. Wait and published by . This book was released on 1964 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Calculated Mode Conversion Coefficients for Graded Height Change in the Earth ionosphere Waveguide at VLF written by K. P. Spies and published by . This book was released on 1968 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mode Calculations for VLF Propagation in the Earth ionosphere Waveguide written by Kenneth P. Spies and published by . This book was released on 1961 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calculated Mode Conversion Coefficients for a Graded Height Change in the Earth ionosphere Waveguide at VLF by Kenneth P Spies and James R Wait written by Kenneth P. Spies and published by . This book was released on 1968 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Results for VLF Mode Conversion in the Earth Ionosphere Waveguide written by Richard A. Pappert and published by . This book was released on 1971 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical results are presented for several mode conversion models which allow for the inhomogeneity and anisotropy of the ionosphere. It is concluded that reflections associated with propagation across the terminator do not significantly affect mode conversion. It is shown that significant departure between mode conversion and WKB mode sums can occur when propagating across the terminator even for transition thicknesses as great as 1000 km. Numerical results are compared with the experimental modeling results of the American Nucleonics Corporation. (Author).
Download or read book VLF Mode Calculations for Propagation Across a Land sea Boundary in the Earth ionosphere Waveguide written by James R. Wait and published by . This book was released on 1968 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Simplified Mode Conversion Program for VLF Propagation in the Earth Ionosphere Waveguide written by Richard A. Pappert and published by . This book was released on 1974 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a variation of an earlier mode conversion program for numerically determining mode conversion coefficients and mode sums for a waveguide which is inhomogeneous along the direction of propagation (invariance normal to the transmitter receiver line is assumed and reflections due to the horizontal inhomogeneity are neglected). Although somewhat more approximate than the earlier program the present version has the advantage of not requiring a full wave fields program for the height gain calculations and can be implemented with about the same ease as a WKB program. It has one advantage over the WKB formulation and that is that mode numbering along the horizontal inhomogeneity is immaterial. The mode conversion program will yield mode conversion coefficients and a mode sum plot for ground based vertical dipole excitation of the vertical electric field at the ground as a function of distance from the transmitter. Since the mode conversion coefficients are independent of transmitter terminator distance, allowance has also been made for incrementing the latter distance and plotting mode sums for the incremented distances.
Download or read book Made Conversion in the Earth Ionosphere Waveguide Classic Reprint written by James R. Wait and published by Forgotten Books. This book was released on 2017-10-28 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Made Conversion in the Earth-Ionosphere Waveguide The method is based on a union of approximate Kirchoff diffraction theory and rigorous mode theory. To simplify the discussion, the problem is considered to be two-dimensional in nature and, thus. 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.
Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Download or read book MADE CONVERSION IN THE EARTH IONOSPHERE WAVEGUIDE written by JAMES R. WAIT and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of the Ionosphere on Communication Navigation and Surveillance Systems written by John M. Goodman and published by . This book was released on 1988 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effective Ionospheric Height for a Simplified Mode Conversion Model at VLF written by Richard A. Pappert and published by . This book was released on 1975 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report generalizes an earlier program for calculating the effects on signal level of mode conversion at VLF/LF frequencies in the earth-ionosphere waveguide. The generalizations are (1) horizontal inhomogeneities are allowed to pass over the transmitter; and (2) the height parameter above which the height gains are discarded and below which the height gains are replaced by a linear combination of Airy functions is allowed to vary from slab to slab. Several methods of selecting the height parameters are examined. Although no one method appears to be superior, the reference height defined by Wait in his studies of exponential profiles, because of ease of implementation, is the preferred method. The present program will yield generalized mode conversion coefficients and a mode sum plot for ground based vertical electric dipole excitation of the vertical electric field at the ground as a function of transmitter-receiver distance or as a function of location of the horizontal inhomogeneity relative to the transmitter for fixed point transmissions.
