An Experimental Study Of Ionospheric Modification Using Radio And Radar Methods
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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.
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 Communications, Military categories.
The propagation medium is, in effect, an integral part of many military systems. For the most part, interest in the propagation medium has been focussed [sic] on identifying and quantifying the limitations it imposes on systems, rather than on ways it might be altered, or controlled. The results of on-going theoretical and experimental research show potential for modifying selected regions of the ionosphere in order to affect radio wave propagation. A variety of modification techniques are being investigated, both ground- and space-based, to increase or decrease existing ionization or to create independent artificial plasmas. These techniques include high power radio waves, lasers, particle beams, and chemical releases. In addition, recent developments in high power RF sources raise concerns over system limitations due to self induced anomalous absorption, ray path deviation and clutter. These proceedings present the current state of ionospheric modification technology, with emphasis on potential applications for enhancing or degrading the performance of military communications, surveillance and navigation systems.
Radar Observations Of Artificial Ionospheric Modification Effects
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Author : Hannah Ming Siu Vickers
language : en
Publisher:
Release Date : 2011
Radar Observations Of Artificial Ionospheric Modification Effects written by Hannah Ming Siu Vickers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Artificial ionospheric modification experiments by means of high power, high frequency radio waves using the EISCAT (European Incoherent SCATter) heater at Troms?, northern Norway have been carried out for nearly three decades. These experiments are associated with large-scale increases in the electron temperature and density and generation of small-scale plasma irregularities, which are diagnosed by the EISCAT UHF and CUTLASS (Cooperative UK Twin Located Auroral Sounding System) HF radars. Experimental results from the EISCAT UHF radar, obtained from heating campaigns atTroms? between 1996 and 1999, are used to study the effects of heater-induced instabilities on the analyses of EISCAT spectra. Plasma turbulence induced by high power heater waves produces unphysical estimates of ionospheric plasma parameters during the initial phase of heating, and a method is developed to correct for these problems. It is shown that these estimates are nevertheless, reliable over longer timescales of heating. In the second study, relaxation characteristics of small-scale density perturbations measured using the CUTLASS Finland radar are modelled theoretically and shown to be largely consistent with large-scale temperatures measured using the EISCAT UHF radar. Certain cases are identified where alternative models of irregularity decay are required to describe the temporal behaviour in radar backscatter. These models consider influences such as electron temperature reductions, wave-wave coupling and background flow. The final study concentrates on a heating experiment in October 2000, where unusually broadened spectral widths of artificial HF backscatter measured with the CUTLASS Finland and Iceland radars was observed. The results were incompatible with previous explanations of similar observations. The Burg maximum entropy analysis was implemented to formulate a tentative explanation for the observations, involving simultaneous detection of artificial and natural irregularity echoes by the Iceland radar. This required the heater amplification of non co-located natural irregularities, already above the noise threshold of the radar.
Radio Techniques For Probing The Terrestrial Ionosphere
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Author : Robert D. Hunsucker
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-07
Radio Techniques For Probing The Terrestrial Ionosphere written by Robert D. Hunsucker and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-07 with Science categories.
In the years since the pioneering efforts of Sir Edward Appleton, M. A. F. Barnett, G. Breit, and M. A. Thve, many radio techniques have been employed to investigate the terrestrial ionosphere. The purposes of this book are to exam ine the basic physical interaction process of radio waves with the ionosphere, scrutinize each of the radio techniques currently in use, and describe the elements of each technique, as well as assess their capabilities and limitations. I have included some of the history of each technique, since we often tend to forget the efforts of the "pioneers". The interaction of radio waves with the terrestrial ionosphere has been described in considerable detail in several "classic" treatments, e.g., Ratcliffe (1959), Al'pert (1963), Budden (1961) and Davies (1965), Rishbeth and e.g., Flock (1979), Davies Garriott (1969), and in other more recent books, (1990), Hargreaves (1979), and Budden (1985). A few of the radio techniques have been described by Hargreaves (1979) and a book by Giraud and Petit (1978) has also included discussion of several of the techniques. The "WITS" handbook No. 2 (1989) also contains description of several radio techniques.
Department Of Defense Appropriations For
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Author : United States. Congress. House. Committee on Appropriations
language : en
Publisher:
Release Date : 1973
Department Of Defense Appropriations For written by United States. Congress. House. Committee on Appropriations and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with categories.
Publications July 1960 Through June 1966
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Author : United States. National Bureau of Standards
language : en
Publisher:
Release Date : 1967
Publications July 1960 Through June 1966 written by United States. National Bureau of Standards and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Standardization categories.
Defense Agencies Monday October 1 1973
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Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Defense
language : en
Publisher:
Release Date : 1973
Defense Agencies Monday October 1 1973 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Defense and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with United States categories.
Department Of Defense Appropriations For 1974
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Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Defense
language : en
Publisher:
Release Date : 1973
Department Of Defense Appropriations For 1974 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Defense and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with United States categories.
Department Of Defense Appropriations For 1974
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Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Dept. of Defense Appropriations
language : en
Publisher:
Release Date : 1973
Department Of Defense Appropriations For 1974 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Dept. of Defense Appropriations and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with United States categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
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 1994 with Aeronautics categories.