Download or read book Hf Communication Effects Physics and Chemistry of the Ionosphere written by R. C Whitten (Jr) and published by . This book was released on 1965 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ionosphere from 50 to 700 km is discussed in an attempt to provide information of value and interest to radio communicators. Diurnal, seasonal, and solar cyclical variations of the ionosphere are considered as well as effects of diffusion, turbulence and winds, tidal and wave motions, chemical reactions, and magnetic disturbances. Ionization by extreme UV photons, solar X-rays, and Lyman-alpha and cosmic radiation are presented as functions of solar activity. The ionization and deionization processes (dissociation, recombination, charge transfer, and ion-atom interchange) that control ion and electron densities in the ionosphere are discussed. Detailed models of (1) the quiet ionosphere, (2) sudden ionic disturbances, (3) polar cap absorption events, and (4) ionospheric and geomagnetic storms are developed. Current theories of ionospheric processes and phenomena are evaluated and remaining problems of interpretation pointed out. (Author).
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Physics and Aeronomy Ionosphere Dynamics and Applications written by Chao Huang and published by John Wiley & Sons. This book was released on 2021-05-11 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of global ionospheric research from the polar caps to equatorial regions It's more than a century since scientists first identified the ionosphere, the layer of the Earth’s upper atmosphere that is ionized by solar and cosmic radiation. Our understanding of this dynamic part of the near-Earth space environment has greatly advanced in recent years thanks to new observational technologies, improved numerical models, and powerful computing capabilities. Ionosphere Dynamics and Applications provides a comprehensive overview of historic developments, recent advances, and future directions in ionospheric research. Volume highlights include: Behavior of the ionosphere in different regions from the poles to the equator Distinct characteristics of the high-, mid-, and low-latitude ionosphere Observational results from ground- and space-based instruments Ionospheric impacts on radio signals and satellite operations How earthquakes and tsunamis on Earth cause disturbances in the ionosphere The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals. Find out more about the Space Physics and Aeronomy collection in this Q&A with the Editors in Chief
Download or read book The Ionosphere written by L. F. McNamara and published by . This book was released on 1991 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introductory text describes the ionosphere and its effects on systems which use it, giving special emphasis to HF communications. Further sections cover topics such as the single station location of HF transmitters and over-the-horizon radar.
Download or read book Effects of Ionospheric Scattering on Very Long Distance Radio Communication written by H.A. Whale and published by Springer. This book was released on 2013-12-06 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long Distance Propagation of HF Radio Waves written by Aleksandr Viktorovich Gurevich and published by Springer. This book was released on 1985 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The High Latitude Ionosphere and its Effects on Radio Propagation written by R. D. Hunsucker and published by Cambridge University Press. This book was released on 2007-09-10 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: A modern treatment of the physics and phenomena of the ionosphere, beginning with the basics of radio propagation and the use of radio techniques in ionospheric studies. Ample cross-referencing, chapter summaries and reference lists make this book an invaluable aid for graduate students, ionospheric physicists and radio engineers.
Download or read book Hf Communication Effects Simulation the Ionosphere Above 100 Km a Simple Model written by Robert Craig Whitten and published by . This book was released on 1964 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model of the quiet ionosphere in the altitude range 100 to 500 km for various conditions of solar activity is constructed. In order to carry out this program, a model atmosphere, i.e., profiles of temperature density, pressure, number density of the various constituents, and scale height, based on rocket and satellite measurements and on models developed by other investigators, is also developed. From the model atmosphere and from measurements of the intensities of solar ionizing radiations, ionization rate profiles are computed. Electron loss and diffusion processes and their associated rate constants are also treated, and the results are substituted into appropriately simplified forms of the continuity equation; the solutions yield the ionospheric model. E- and F-region irregularities are also discussed, and a model of electron collision frequencies in the altitude range 100 to 500 km is presented. (Author).
Download or read book Siting Criteria for HF Communication Centers written by William F. Utlaut and published by . This book was released on 1962 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: This note is intended to provide an engineering guide for the siting radio terminals for use in long-range HF communication systems. A brief summary of ionospheric effects upon HF radio signals is presented. Various factors required for an ideal site such as Fresnel zone size and smoothness, noise, antenna height, vertical radiation angle and electrical characteristics of the ground are discussed. Standards to guide compromises for practical cases of siting are considered. A partial bibliography which may be useful for those desiring a greater depth of understanding of the various subjects considered in provided.
Download or read book Chemistry of the Ionosphere written by A. Danilov and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: I was very happy to learn that Plenum Press has decided to publish an English edition of Chemistry of the Ionosphere. Although the book was largely intended for the Soviet reader in order to fill some gaps in Russian-language reviews on aeronomic problems, I hope that it may be useful to foreign specialists engaged in iono spheric research as well. Naturally, during the time which has elapsed since the preparation of the Russian edition new studies have been published in the world literature on the problems dealt with in this book. The most important of these are noted in the ap pendix to this edition, but some problems (for example, with respect to the physics of negative ions in the lower ionosphere) require a radical reexamination, which cannot be done in a brief appendix. I will be pleased if publication of the book in English will as sist in removing some of the currently existing ambiguities in basic problems of upper atmosphere chemistry. A. D. Danilov Preface to the Russian Edition 1 In the last decade surprising successes have been achieved in the study of the earth's upper atmosphere by use of rockets and artificial satellites. These investigations have made it clear that the upper atmosphere (and particularly the ionospheric region at altitudes 100-1000 km) is a considerably more complex formation than could be visualized prior to the advent of active studies with space vehicles.
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 722 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 Physics of Natural and HF Induced Ionospheric Disturbances and Their Effects on Radio Communication written by Lee, Min-Chang and published by . This book was released on 1985 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a theoretical study of ionospheric disturbances caused by either natural or man-made processes. Thirteen papers published in either technical journals or conference proceedings are compiled in this report, These papers discuss (1) the identification of the sources of free energy, the optimum conditions for plasma instabilities as the courses of naturally occurring ionospheric irregularities, and (2) the nonlinear effects leading to the HF ionospheric disturbances such as lower hybrid waves, upper hybrid waves, ionospheric irregularities, and geomagnetic field fluctuations. Originator-supplied keywords: Ohmic dissipation of Pederson current, High-latitude F region ionospheric irregularities, Thermal instabilities, Polar cap, Lower hybrid waves, Field aligned plasma density striations, Whistlers, Magnetostatic fluctuations, Filamentation instability, Thermal source, Geomagnetic field fluctuations, Ionospheric heating, Langumiur waves, Saturation spectrum of parametric decay instability, Upper hybrid waves, O-mode and X-mode pump waves, Pondermotive force, Plasma line enhancement, Beating current, Non-oscillatory modes, Oscillatory two-stream instability, Nonlinear effects, Spread F echoes, Modulational instability.
Download or read book Nonlinear Phenomena in the Ionosphere written by A. Gurevich and published by Springer. This book was released on 2012-08-03 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear effects in the ionosphere (cross modulation of radio waves) have been known since the 1930s. Only recently, however, has the rapid increase in the power and directivity of the radio transmitters made it possible to alter the properties of the ionosphere strongly and to modify it artificially by applying radio waves. This has revealed a variety of new physical phenomena. Their study is not only of scien tific interest but also undisputedly of practical interest, and is presently progressing very rapidly. This monograph is devoted to an exposition of the present status of theoretical research on this problem. Particular attention is paid, naturally, to problems in the development of which the author himself took part. It is my pleasant duty to thank V. L. Ginzburg, L. P. Pitaevskii, V. V. Vas'kov, E. E. Tsedilina, A. B. Shvartsburg, and Va. S. Dimant for useful discussions and for valuable remarks during various stages of the work on the problem considered in this book. Contents 1. Introduction . . . . . . . . . . . . . . . . . . .
Download or read book HF Communication Effects written by T. I. Dayharsh and published by . This book was released on 1965 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interrelationships of particular high-latitude phenomena--E sub s, magnetic storms, complex ray paths, and field-aligned ionization--and HF oblique sounder observations from five paths for one year are analyzed in this report. Magnetic field deviations produced during magnetic storms were found to be highly correlated with ionospheric variations that occurred one to three hours after the magnetic variations. Equations relating the magnetic field variations to the ionospheric variations are developed in this report with generally favorable results. Prediction of E sub s oblique mode occurrences and MOFs from vertical sounder data is also presented in this report. The sounder data was used to plot maps of f sub o E sub s and percent occurrence. Good agreement is found between the observed oblique mode statistics on four paths and those predicted from the maps. Ray-tracing techniques were used to simulate the observed oblique ray paths from vertical -incidence sounder data taken along the oblique paths. It was found that ray-tracing techniques were remarkably accurate, considering the drastic variations in ionospheric parameters along the path. Ray-tracing techniques for modes using field-aligned ionization are also presented in this report. Time delays derived by these techniques fit remarkably well with statistics for the observed scatter-modes on two paths. (Author).
Download or read book Effect of the Ionosphere on Space Systems and Communications written by John M. Goodman and published by . This book was released on 1975 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NBS Technical Note written by and published by . This book was released on 1962 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
