Ionospheric Modification By High Power Obliquely Propagated Hf Radio Wave Transmissions Part 1 Experimental
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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 Obliquely Propagated Hf Radio Wave Transmissions Part 1 Experimental
DOWNLOAD
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.
Preliminary Investigation Of Ionospheric Modification Using Oblique Incidence High Power Hf Radio Waves
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Author : Gary S. Sales
language : en
Publisher:
Release Date : 1986
Preliminary Investigation Of Ionospheric Modification Using Oblique Incidence High Power Hf Radio Waves 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 1986 with categories.
A special experiment was carried out using a high powered transmitter and a high gain rhombic antenna to heat the ionosphere at a distance of 1300 km from the transmitter. A Digisonde ionospheric sounder was located at the midpoint to sense any changes that might occur in the ionosphere at the heating cycle period of ten minutes. The measured phase data was processed using spectrum analysis in an attempt to detect this ten minute period. The results are not conclusive but there is some indication that the heating period was detected only during the nighttime in agreement with theoretical prediction. Keywords: Ionosphere; Modification; High frequency; Propagation.
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.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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.
Observation Of Ionospheric Modification Using High Power Oblique Hf Transmissions
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Author :
language : en
Publisher:
Release Date : 1992
Observation Of Ionospheric Modification Using High Power Oblique Hf Transmissions 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.
A series of experiments were carried out during late May 1991 to investigate changes produced in the ionosphere by a high power HF transmitter operating at a frequency approximately two times the F-layer critical frequency. These high power oblique transmissions heated a region of the ionosphere some 1200km east of the Delano, CA Voice of America relay station, operating with an effective radiated power of 90 dBW. An HF probe signal was used to detect changes in the ionosphere as it passed through the modified region. The probe system, operating at a frequency very close to the heater frequency, frequently showed amplitude changes that correlate well with the ten minute on/off cycling of the high power transmitter. This preliminary study used several signal processing methods to detect these changes in the presence of strong polarization fading. The results indicate that the amplitude of the probe signal decreased by 2 to 3 dB, often within 15 to 30s after the high power transmitter was turned on.
Nuclear Science Abstracts
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Author :
language : en
Publisher:
Release Date : 1975
Nuclear Science Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Nuclear energy categories.
Assembl E Pl Ni Re
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Author : International Radio Consultative Committee
language : en
Publisher:
Release Date : 1990
Assembl E Pl Ni Re written by International Radio Consultative Committee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Radio categories.
Journal Of Research National Bureau Of Standards
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Author : United States. National Bureau of Standards
language : en
Publisher:
Release Date : 1964
Journal Of Research National Bureau Of Standards 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 1964 with Ionospheric radio wave propagation categories.
Oblique Ionospheric Radiowave Propagation At Frequencies Near The Lowest Usable High Frequency
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Author : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Electromagnetic Wave Propagation Committee
language : en
Publisher:
Release Date : 1969
Oblique Ionospheric Radiowave Propagation At Frequencies Near The Lowest Usable High Frequency written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Electromagnetic Wave Propagation Committee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Ionospheric radio wave propagation categories.