Hydromagnetic Waves In The Magnetosphere And The Ionosphere
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Hydromagnetic Waves In The Magnetosphere And The Ionosphere
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Author : Leonid S. Alperovich
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-12-05
Hydromagnetic Waves In The Magnetosphere And The Ionosphere written by Leonid S. Alperovich 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 2007-12-05 with Science categories.
Here is a fascinating text that integrates topics pertaining to all scales of the MHD-waves, emphasizing the linkages between the ULF-waves below the ionosphere on the ground and magnetospheric MHD-waves. It will be most helpful to graduate and post-graduate students, familiar with advanced calculus, who study the science of MHD-waves in the magnetosphere and ionosphere. The book deals with Ultra-Low-Frequency (ULF)-electromagnetic waves observed on the Earth and in Space.
The Role Of Hydromagnetic Waves In The Magnetosphere And The Ionosphere
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Author : S. P. Kuo
language : en
Publisher:
Release Date : 1988
The Role Of Hydromagnetic Waves In The Magnetosphere And The Ionosphere written by S. P. Kuo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
The topics of investigation are divided into four general categories: (a) cavity modes of the magnetosphere resulting in the discrete spectrum of the resonant ultralow frequency waves; (b) a hydromagnetic code for the numerical study of the coupling of hydromagnetic waves in the dipole model of the magnetosphere; a theoretical model developed for explaining the phenomenon of plasma line over shoot observed in the ionospheric HF heating experiments; and thermal flamentation instability as the mechanism for generation of large scale field aligned ionospheric irregularities. For the first two topics, the hydromagnetic wave equations are analyzed analytically in cylindrical model of the magnetosphere and numerically in dipole model of the magnetosphere, respectively. While the steady state eigenvalue problem is studied in the first topic, the second topic is generalized to the boundary value problem considering the coupling between hydromagnetic waves in the realistic geometry of the magnetosphere. For the third topic, a nonlinear turbulent theory (resonance instability excited by a powerful high frequency in the ionosphere. For the last topic, the thermal nonlinearity gives rise to the mode-mode coupling; threshold field and the growth rate of the instability are derived. (jhd).
Low Attenuation Of Hydromagnetic Waves In The Ionosphere And Implied Characteristics In The Magnetosphere For Pc1 Events
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Author : Institute for Telecommunication Sciences and Aeronomy (U.S.)
language : en
Publisher:
Release Date : 1967
Low Attenuation Of Hydromagnetic Waves In The Ionosphere And Implied Characteristics In The Magnetosphere For Pc1 Events written by Institute for Telecommunication Sciences and Aeronomy (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Ionosphere categories.
Controlled Artificial Generation Of Ultra Low Frequency Hydromagnetic Waves In The Ionosphere And Magnetosphere
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Author : O. G Villard (Jr)
language : en
Publisher:
Release Date : 1978
Controlled Artificial Generation Of Ultra Low Frequency Hydromagnetic Waves In The Ionosphere And Magnetosphere written by O. G Villard (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
This report summarizes theoretical and experimental work sponsored by the Defense Advanced Projects Agency at Stanford University through the Office of Naval Research Contract No. N00014-75-C-1095. The primary purpose of this work, which was conducted during the interval 1 January 1975 through 28 February 1977, was to investigate the possibility of obtaining a relatively inexpensive method for the controlled artificial generation of ultra-low-frequency (ULF; frequencies less than 5 Hz) geomagnetic pulsations. Because of the great penetration of these signals in sea water, the controlled artificial source could conceivably be used as a transmitter to communicate with deeply submerged receivers at a low data rate. A second purpose of the work was to investigate the feasibility of using airborne loop antennas for air/undersea communication at ULF. The following are the major conclusions of this work; (1) The controlled artificial generation of ULF geomagnetic pulsations by the 'peninsula method, ' i.e., by the passage of a ULF-modulated electric current around a relatively nonconducting peninsula in the sea or in a large saline lake, is feasible and that further experiments, in particular, a fullscale ULF wave generation experiment, appear desirable. (2) The controlled artificial generation of ULF geomagnetic pulsations by the 'VLF method, ' i.e., by the injection of ULF-modulated VLF signals into the magnetosphere from a large ground-based VLF transmitter, appears possible, but further theoretical and experimental studies are required to clarify the generation mechanism.
The Propagation Of Radio Waves
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Author : K. G. Budden
language : en
Publisher: Cambridge University Press
Release Date : 1988-08-04
The Propagation Of Radio Waves written by K. G. Budden and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988-08-04 with Science categories.
This book is concerned with the ionosphere and the magnetosphere, and the theory of their effect on radio waves. It includes accounts of some mathematical topics now widely used in this study, particularly W. K. B. approximations, Airy integral functions and integration by steepest descents. The subject is divided into ray theory and full wave theory. Ray theory is useful for high frequencies when the ionosphere is treated as a horizonally stratified medium. The discussion of the magnetosphere, whose structure is more complicated, includes an account of whistlers and ion cyclotron whistlers. The book has been planned both for final year undergraduates and as a reference book for research. It is suitable as a course book on radio propagation for students of physics or electrical engineering or mathematics. Some of the topics are presented from an elementary viewpoint so as to help undergraduates new to the subject. The later parts are more advanced. Because the subject is so large and has seen many important recent advances, some topics have had to be treated briefly, but there is a full bibliography with about 600 references.
Spectrum Of Hydromagnetic Waves In The Exosphere
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Author : Gordon James MacDonald
language : en
Publisher:
Release Date : 1962
Spectrum Of Hydromagnetic Waves In The Exosphere written by Gordon James MacDonald and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Atmosphere, Upper categories.
A disturbance in the exosphere generates waves in three partially separable modes. These modes are described by considering the vorticity about a line of force, the two-dimensional divergence of velocity in the plane perpendicular to the line of force, and the component of velocity along the line of force. The propagation of vorticity is one-dimensional and there is no geometrical attenuation; energy is lost only through the finite conductivity of the medium. The propagation of the longitudinal velocity component is almost one-dimensional but is heavily damped at high frequencies. In a gravitational field, the medium is no longer uniform and at low frequencies the modes are coupled in a complicated way. For parallel magnetic and gravitational fields, the vorticity mode is still separable and gravity leads to anisotropic dispersion in the other modes.-p.i.
The Transmission Of Hydromagnetic Waves Through The Ionosphere
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Author : Ilan Josip Rothmuller
language : en
Publisher:
Release Date : 1971
The Transmission Of Hydromagnetic Waves Through The Ionosphere written by Ilan Josip Rothmuller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Ionospheric radio wave propagation categories.
Spectrum Of Hydromagnetic Waves In The Exosphere
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Author : Gordon J. F. MacDonald
language : en
Publisher:
Release Date : 1962
Spectrum Of Hydromagnetic Waves In The Exosphere written by Gordon J. F. MacDonald and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Exosphere categories.
A disturbance in the exosphere generates waves in three partially separable modes. These modes are described by considering the vorticity about a line of force, the two-dimensional divergence of velocity in the plane perpendicular to the line of force, and the component of velocity along the line of force. The propagation of vorticity is one-dimensional and there is no geometrical attenuation; energy is lost only through the finite conductivity of the medium. The propagation of the longitudinal velocity component is almost one-dimensional but is heavily damped at high frequencies. In a gravitational field, the medium is no longer uniform and at low frequencies the modes are coupled in a complicated way. For parallel magnetic and gravitational fields, the vorticity mode is still separable and gravity leads to anisotropic dispersion in the other modes.
Geomagnetic And Ionospheric Effects Of Magnetospheric Motions
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Author : Hermann Poeverlein
language : en
Publisher:
Release Date : 1966
Geomagnetic And Ionospheric Effects Of Magnetospheric Motions written by Hermann Poeverlein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Geomagnetism categories.
Hydromagnetic Waves In The Ionosphere
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Author : Muhammad Abbas
language : en
Publisher:
Release Date : 1967
Hydromagnetic Waves In The Ionosphere written by Muhammad Abbas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Magnetohydrodynamics categories.
The report is concerned with the analysis of hydromagnetic waves which are generated in various regions of the magnetosphere and propagated to the earth in the extremely low frequency spectrum. Two different aspects of the problem are investigated, namely, propagation through inhomogeneous regions of the ionosphere and propagation and excitation of waves in current carrying regions of the ionosphere and the magnetosphere. Propagation through inhomogeneous regions is studied by two different methods: Transmission coefficients for hydromagnetic waves are obtained by assuming a linearly varying inhomogeneous region and by transforming the wave equation into a hypergeometric equation such that various types of inhomogeneities can be handled (Epstein theory). Assuming a hydromagnetic wave incident from above and propagating parallel to the earth's magnetic field, power transmission coefficients are calculated for various times of day. Propagation of hydromagnetic waves through a current carrying plasma is investigated on the basis of macroscopic equations in which additional terms arising from the presence of a constant current density are included. A general dispersion relation for small amplitude waves is derived. For propagation normal to the steady magnetic field, when the currents are normal to both, the direction of propagation and the static magnetic field, it is found that amplification takes place. For longitudinal propagation with currents in the transverse plane, the propagation constant remains unaffected. For longitudinal propagation, with currents also along the direction of propagation, the propagation constant has a resonance at the ion-cyclotron frequency for both, right and left hand polarization. (Author).