Historical Overview Of Hf Ionospheric Modification Research
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Historical Overview Of Hf Ionospheric Modification Research
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Author : William E. Gordon
language : en
Publisher:
Release Date : 1990
Historical Overview Of Hf Ionospheric Modification Research written by William E. Gordon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Radio waves have inadvertently modified the Earth's ionosphere since the Luxembourg observations of Tellegen in 1933 and perhaps since Marconi in 1901. The history of ionospheric modification by radio waves is reviewed, beginning with Marconi, describing the Luxembourg effect and its explanations, and its early use to deduce the properties of the lower ionosphere in the 1930s. 'ne measurements became more sophisticated in the 1950s, leading to the call for high-power high-frequency modification experiments in the upper ionosphere. Beginning in 1970, radio facilities became available of sufficient powers to induce changes in the ionospheric plasma detectable by a wide array of diagnostic instruments and techniques. A summary of these effects is presented based upon work up to 1990. These studies were originally motivated as a means of better understanding the natural ionosphere using a weak perturbational approach. However, a rich spectrum of nonlinear wave-plasma interactions was quickly discovered and ionospheric modification research became strongly motivated by issues in basic plasma physics. The ionosphere and near-Earth space are now exploited as an exceptional plasma laboratory-without-walls for the study of fundamental plasma processes requiring large spatial or temporal scales. Here we present a brief overview of these processes and phenomena, illustrated using results obtained from the Arecibo ionospheric modification facilities. The lessons learned and phenomena explored thus far offer many opportunities for controlling the ionospheric environment critical to many civilian and military telecommunications systems, both to disrupt systems normally operational and to create new propagation paths otherwise unavailable.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1991
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aeronautics categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1989
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Aeronautics categories.
A Review Of Some Ionospheric Studies Based On A High Frequency Doppler Technique
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Author : D. M. Baker
language : en
Publisher:
Release Date : 1968
A Review Of Some Ionospheric Studies Based On A High Frequency Doppler Technique written by D. M. Baker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Ionosphere categories.
This report contains a review of the work done on frequency fluctuations of ionospheric radio echoes on high frequencies. The historical aspects are briefly discussed to show the development of research on solar flare effects and the motion of ionospheric irregularities. The recording program over the past 7 years and the equipment modifications involved are discussed. This is followed by a brief review of the elementary theory underlying frequency fluctuations. In most of the report the mathematical equations are listed in tables rather than distributed throughout the text. Solar flare effects (called sudden frequency deviations) are used to determine the relaxation time of the ionosphere.
Ionospheric Modification By High Power Obliquely Propagated Hf Radio Wave Transmissions Part 1 Experimental
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Author : United States. Air Force Materiel Command
language : en
Publisher:
Release Date : 1993
Ionospheric Modification By High Power Obliquely Propagated Hf Radio Wave Transmissions Part 1 Experimental written by United States. Air Force Materiel Command and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
Ionospheric Modification By High Power Radio Waves
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Author :
language : en
Publisher:
Release Date : 1981
Ionospheric Modification By High Power Radio Waves written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
Powerful, high-frequency radio waves have been used to temporarily modify the ionosphere. Thermal and parametric interactions have led to a diverse range of observed phenomena, including generation of density striations and artificial spread-F, enhancements of electron plasma waves, production of extrathermal electron fluxes and enhanced airglow, modification of the D-region temperature and densities, wideband signal attenuation, and self-focusing and scattering of the electromagnetic waves. The physics of ionospheric modification by high-power radio waves is reviewed in the context of our current theoretical understanding; disturbance generation mechanisms are qualitatively described. In addition, results of recent experiments are summarized in which ionospheric irregularities are generated and their evolution and decay processes investigated in detail. The effects and potential controlled applications of these HF ionospheric modifications for various RF systems studies are discussed. The C3I scientific community provides an important motivation for these ionospheric modification studies; their increased interaction and active participation in experimental design and interpretation are encouraged.
Soviet Ionospheric Modification Research
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Author :
language : en
Publisher:
Release Date : 1988
Soviet Ionospheric Modification Research written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Ionosphere categories.
A Review Of Some Ionospheric Studies Based On A High Frequency Doppler Technique
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Author :
language : en
Publisher:
Release Date : 1968
A Review Of Some Ionospheric Studies Based On A High Frequency Doppler Technique written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Doppler effect categories.
This report contains a review of the work done on frequency fluctuations of ionospheric radio echoes on high frequencies. The historical aspects are briefly discussed to show the development of research on solar flare effects and the motion of ionospheric irregularities. The recording program over the past 7 years and the equipment modifications involved are discussed. This is followed by a brief review of the elementary theory underlying frequency fluctuations. In most of the report the mathematical equations are listed in tables rather than distributed throughout the text. Solar flare effects (called sudden frequency deviations) are used to determine the relaxation time of the ionosphere.
Modeling Of Hf Propagation And Heating In The Ionosphere
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Author :
language : en
Publisher:
Release Date : 1992
Modeling Of Hf Propagation And Heating In The Ionosphere written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
The purpose of the program of research reported here is to develop and demonstrate a realistic numerical model for self-consistent ionospheric propagation and heating of powerful frequency (HF) waves by conjoining existing, separate numerical models for high frequency wave propagation and ionospheric transport. A comprehensive numerical implementation of plasma geometric optics has been enhanced and adapted to the problem of self-consistent ionospheric propagation of high power, high frequency radar signals. The emphasis in this work is on the realistic and rigorous description of the propagation waves so that geometric and spectral characteristics of nonlinear ionospheric effects can be predicted in detail. The plasma geometric optics code has been used in conjunction with an ionospheric transport code to determine self-consistently the HF radiation field and quasilinear modifications of ionospheric plasma properties due to ohmic dissipation of the HF radiation. This allows detailed study of nonlinear phenomena such as beam self-focusing formation of large-scale density cavities and striations, and induced wave ducting. Overviews of the theory underlying the existing models of radiation propagation and ohmic power deposition are given, and enhancements to these models are described. New results achieved using the enhanced models are shown and the treatment of a self-consistent propagation and heating problem is presented. Ray Tracing, Ionospheric Modification, Over-the-Horizon Radar Propagation, Ionospheric HF propagation, HF Heating of Ionosphere, Ionospheric Clutter.
Results Of A High Power Oblique Incidence High Frequency Ionospheric Modification Experiment
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Author : Gary S. Sales
language : en
Publisher:
Release Date : 1989
Results Of A High Power Oblique Incidence High Frequency Ionospheric Modification Experiment written by Gary S. Sales and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.