Nonlinear Phenomena Arising From Radio Wave Heating Of The Lower Ionosphere
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Nonlinear Phenomena Arising From Radio Wave Heating Of The Lower Ionosphere
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Author : Albert Andrew Tomko
language : en
Publisher:
Release Date : 1981
Nonlinear Phenomena Arising From Radio Wave Heating Of The Lower Ionosphere written by Albert Andrew Tomko 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.
This document describes a theoretical and experimental study of the interaction of high power, high frequency radio waves with the lower ionosphere. The theoretical calculations presented here show that the electron temperature of the ionospheric plasma can be greatly enhanced when the plasma is irradiated by a powerful groundbased HF transmitter with an effective radiated power of the order of 100 MW. If this plasma heating is maintained for times exceeding a few seconds, the composition of the plasma can also be altered. These temperature and composition modifications cause significant changes in the plasma conductivity and wave absorption in the medium. Two experiments were conducted in order to test for the predicted absorption and conductivity modifications: a vertical incidence plus absorption experiment and a nonlinear demodulation experiment. Data from the absorption experiment clearly show a large (9 dB) increase in wave absorption at 2.4 MHz due to a high power (60 MW ERP) HF heating of the ionosphere. The nonlinear demodulation experiment generated strong VLF radiation when the ionosphere was irradiated by a powerful modulated HF wave. These VLF signals are believed to be due to HF heating induced conductivity modulation of the dynamo current system. (Author).
Nonlinear Phenomena In The Ionosphere
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Author : A. Gurevich
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Nonlinear Phenomena In The Ionosphere written by A. Gurevich 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 2012-12-06 with Science categories.
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 . . . . . . . . . . . . . . . . . . .
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.
Radio Wave Heating Of The Lower Ionosphere
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Author : Matthew J. Freeman
language : en
Publisher:
Release Date : 1993
Radio Wave Heating Of The Lower Ionosphere written by Matthew J. Freeman 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.
Investigation Of Nonlinear Interaction Phenomena In The Ionosphere
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Author : H. C. Hsieh
language : en
Publisher:
Release Date : 1965
Investigation Of Nonlinear Interaction Phenomena In The Ionosphere written by H. C. Hsieh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Ionosphere categories.
Technical Abstract Bulletin
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Author :
language : en
Publisher:
Release Date : 1981
Technical Abstract Bulletin 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 Science categories.
Nonlinear Amplification And Generation Of Very Low Frequency Waves In The Near Earth Space Environment
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Author : Justin D. Li
language : en
Publisher:
Release Date : 2015
Nonlinear Amplification And Generation Of Very Low Frequency Waves In The Near Earth Space Environment written by Justin D. Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Whistler-mode waves are intense electromagnetic radio waves that are known to be key drivers of energetic particle dynamics in the Earth's radiation belts. Despite many decades of active research, fundamental questions still remain concerning the interaction of whistler-mode waves with energetic electrons, especially in regard to nonlinear phenomena including wave amplification. The Siple Transmitter Experiment, which operated in Antarctica from 1973 to 1988, provided researchers a rare opportunity to perform controlled experiments on nonlinear wave-particle interactions. Very low frequency waves in the few kilohertz range radiated by the transmitter at Siple Station propagate into the magnetosphere where they interact with energetic electrons. The interactions modify the waves, amplifying them and generating new frequency components. The modified waves are then observed with radio receivers on the ground at the magnetic conjugate point in the northern hemisphere. The Siple Experiment produced many new and fascinating observations of wave-particle interactions; however, during the experiment, available data analysis tools allowed for only a fraction of the data collected to be analyzed. Moreover, theoretical understanding of the physical processes driving the interactions was limited at the time. We present statistical analysis of data collected in 1986 from the Siple Experiment to quantify nonlinear growth rates and total nonlinear growth of very low frequency waves injected into the magnetosphere, which are useful for bounding theoretical discussion and numerical simulation of wave-particle interactions. We consider a specific amplification phenomenon, termed preferential magnetospheric amplification, by quantifying the preferential effect of injected rising versus falling swept-frequency waves and by examining the theoretical mechanism involved using a Vlasov-Maxwell numerical simulation. The modeling efforts, validated by the data, reveal that the total amplification depends on the linear growth rate and the onset and duration of nonlinear growth, which for typical hot plasma parameters favors injected rising swept frequency waves. In addition to the amplification process, wave-particle interactions can also generate new very-low frequency waves called triggered emissions. These triggered emissions have not been yet well characterized and pose significant challenges for theoretical interpretation and numerical modeling. We present a comprehensive description of triggered emission behavior observed in 1986 by quantifying time and frequency changes and demonstrating the significant dependence of the emission behavior on the frequency-time format of the injected signal. The triggered emission characteristics can be used to evaluate the validity of current numerical models and provide a framework for describing wave behavior in the magnetosphere. Finally, we demonstrate the application of modern machine learning techniques for predicting observations of transmissions from the Siple experiment as a suggested approach to further study of the large sets of data in the field of space physics.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1981
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 1981 with Aeronautics categories.
The Earth S Ionosphere
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Author : Michael Kelly
language : en
Publisher: Elsevier
Release Date : 2012-12-02
The Earth S Ionosphere written by Michael Kelly and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-02 with Science categories.
The Earth's Ionosphere: Plasma Physics and Electrodynamics emphasizes the study of plasma physics and electrodynamics of the ionosphere, including many aeronomical influences. The ionosphere is somewhat of a battleground between the earth's neutral atmosphere and the sun's fully ionized atmosphere, in which the earth is embedded. One of the challenges of ionosphere research is to know enough about these two vast fields of research to make sense out of ionospheric phenomena. This book provides insights into how these competing sources of mass, momentum, and energy compete for control of the ionosphere. Some of the topics discussed include the fundamentals of ionospheric plasma dynamics; equatorial plasma instabilities; high-latitude electrodynamics; and instabilities and structure in the high-latitude ionosphere. Throughout this text only the region above 90 km are discussed, ignoring the D region entirely. This publication is a good source of information for students and individuals conducting research on earth’s ionosphere.
Nuclear Science Abstracts
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Author :
language : en
Publisher:
Release Date : 1976
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 1976 with Nuclear energy categories.