Ionospheric Modification
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Wave Interaction Observations Of Ionospheric Modification In The D Region
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Author : C. J. Chilton
language : en
Publisher:
Release Date : 1981
Wave Interaction Observations Of Ionospheric Modification In The D Region written by C. J. Chilton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Electromagnetic interactions 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.
Ionospheric Modification And Its Potential To Enhance Or Degrade The Performance Of Military Systems
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Author : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Electromagnetic Wave Propagation Panel. Symposium
language : en
Publisher:
Release Date : 1990
Ionospheric Modification And Its Potential To Enhance Or Degrade The Performance Of Military Systems written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Electromagnetic Wave Propagation Panel. Symposium and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Aeronautics categories.
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.
Ionospheric Modification By Rocket Effluents
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Author : Paul A. Bernhardt
language : en
Publisher:
Release Date : 1980
Ionospheric Modification By Rocket Effluents written by Paul A. Bernhardt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Ionosphere categories.
New Concepts In Ionospheric Modification
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Author : P. M. Banks
language : en
Publisher:
Release Date : 1987
New Concepts In Ionospheric Modification written by P. M. Banks and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
This report considers the ionospheric modification that can be produced by energetic charged particle and photon beams, which are emitted from a platform or vehicle (spacecraft or rockets) located in the ionosphere. The various beams considered include (1) charged particle beams composed of low, moderate, and high energy electrons, (2) beams of ions and plasma, and (3) photon beams of soft X rays and extreme ultraviolet radiation. Briefly considered, in addition to the beam topics, is the ionospheric modification produced by the release of neutral gas of high molecular weight from a rapidly moving vehicle such as the Space Shuttle Orbiter. When a ranking is made in terms of the new information that may be obtained, the scale of the modification that may be produced, and the availability of beam sources, ionospheric modification by means of relativistic electron beams appears particularly promising. However, all the methods have their own distinctive features which could make their use desirable under particular circumstances. The modification produced by means of beams of soft X rays, for example, is not strongly dependent on the beam's direction relative to the earth's magnetic field, and thus modification can be produced in regions inaccessible to a charged particle beam from the same vehicle. Keywords: Ionospheric modification; Particle beams; Electron beams; Photon beams; Plasma beams. (jhd).
Ionospheric Modification
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Author : International Union of Radio Science. General Assembly
language : en
Publisher:
Release Date : 1982
Ionospheric Modification written by International Union of Radio Science. General Assembly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
An Experimental Study Of Ionospheric Modification Using Radio And Radar Methods
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Author : Åke Hedberg
language : en
Publisher:
Release Date : 1985
An Experimental Study Of Ionospheric Modification Using Radio And Radar Methods written by Åke Hedberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Ionosphere categories.
Overview Of Ionospheric Modification From Space Platforms
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Author : Peter M. Banks
language : en
Publisher:
Release Date : 1990
Overview Of Ionospheric Modification From Space Platforms written by Peter M. Banks 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.
HIS PAPER DISCUSSES SPACE-BORNE, NON-ELECTROMAGNETIC METHODS OF MODIFYING THE E- and F-regions of the terrestrial ionosphere. Of these, the most well-understood is the direct injection of chemical vapors into the ambient medium. The first injection of barium clouds into the upper atmosphere over two decades ago has led to evolution of understanding of complex electrodynamic processes acting in the ionosphere and spawned extensive studies of small-scale plasma instabilities. Modification to the ionosphere can last for up to hours from such injections. other vapors have also been released, including water vapor, SF 6 and more noxious gases, in successful efforts to alter the chemistry of the ionosphere. In another direction, injections of high amu gases from orbiting spacecraft have been made in attempts to understand the non-classical ionization processes involved in the critical ionization velocity (CIV) concept. The results seem to indicate that for CIV to act in space, large quantities of injected gas are required to achieve a minimum interaction volume density. However, in these and other experiments, it has been found that the potential CIV effects are supplemented by a variety of associated classical processes also acting for these same gases. For example, plasma disturbances are associated with neutral gas releases when charge exchange to ambient ions occurs. This leads to the formation of electrostatically polarized plasma clouds around the neutral gas-emitting space platform and these create large disturbances in the ionosphere.