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Author: Clarence Elmer Prince
Publisher:
ISBN:
Category : Magnetohydrodynamics
Languages : en
Pages : 122
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Book Description
Author: Clarence Elmer Prince
Publisher:
ISBN:
Category : Magnetohydrodynamics
Languages : en
Pages : 122
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Book Description
Author: C. E Prince (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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Book Description
A new conductivity dyadic was used to study the propagation of ordinary and extraordinary modes of wave propagation in a partially-ionized gas. The conductivity tensor included effects of all collisions and the motion of neutral particles. Medium parameters were those of the earth's upper atmosphere. The range of frequencies considered was that of geomagnetic micro-pulsations, 0.00110.0 cps. Geomagnetic equatorial regions received special attention. Incoming incident waves were assumed on a plane-stratified ionosphere. Resultant steady-state frequency responses, impulse responses, current density, electric field, and power dissipation profiles, and power spectra for daytime and nighttime atmospheres were computed. A study of coupling between the two characteristic modes showed appreciable collisional coupling in the lowest ionosphere. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 244
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Author: John Alexander Dawson
Publisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 76
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Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Radio
Languages : en
Pages : 934
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Book Description
Author: Howard Don Holden
Publisher:
ISBN:
Category : Atmosphere, Upper
Languages : en
Pages : 85
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Book Description
A boundary value problem based on a model of the earth's upper atmosphere is posed, formulated and solved. A point source is included within the stratified model thus necessitating a full three-dimensional treatment. (This is often an unnecessary complication if one can assume incident plane waves, current sheets, or other sources infinite in extent). By formulating the problem in circular cylindrical coordinates, symmetrys are maximized and double integral inversions are avoided. Due to the earth's static magnetic field, the ionospheric media are anisotropic and the wave equation reduces to a dyadic Helmholtz equation. Seto (1964) has shown this equation to be separable in cylindrical coordinates under certain conditions. This important contribution by Seto is reviewed, somewhat extended, and adapted to the problem at hand. The separation equations lead directly to a dispersion relation. Electromagnetic field ratios (sometimes called wave impedances for an E/H ratio) are derived for an incremental cylinder wave. The boundary condition requirements are satisfied for the layered media numerically by using computational matrices. The advantages and limitations of this method are described. This is followed by a discussion of the contour used in the numerical evaluation of the integral. The vertical inhomogeneities in electrical parameters encountered in the ionosphere are quite severe. To accurately represent a continuously varying medium with a series of homogeneous layers each layer must be relatively thin in terms of wavelength.
Author: S. Matsushita
Publisher: Elsevier
ISBN: 1483222527
Category : Science
Languages : en
Pages : 795
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Book Description
Physics of Geomagnetic Phenomena, Volume II covers the advances in geomagnetism and the penetrations into the generation of geomagnetic field phenomena. This book is composed of three chapters and begins with a discussion on various types of phenomenal disturbances, such as ionospheric and geomagnetic disturbance, aurora, and storm. The next chapter describes certain aspects of space geomagnetism based on satellite and rocket observations. This chapter also examines the origins of geomagnetic disturbance phenomena. The last chapter surveys the problems connected with studies of geomagnetic storms and auroras, along with a hydromagnetic model of these phenomena. This book will be of value to physicists, theoreticians, and scientists in allied fields of geomagnetism.
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1016
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Book Description
Author: J. A. Jacobs
Publisher: Springer Science & Business Media
ISBN: 3642868282
Category : Science
Languages : en
Pages : 187
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Book Description
The subject of geomagnetic micropulsations has developed extremely rapidly and it is difficult to know when is an appropriate time to pause and assess the sum total of our knowledge-both observational and theoretical. There has in recent years been a tremendous increase in both the quantity and quality of data and also many theoretical ad vances in our understanding of the phenomenon. Undoubtedly there will be further progress in both areas but it seems worthwhile now to review both our knowledge and our ignorance. This book was essen tially completed by the end of April 1969 and tries to give a summary of the subject up to that time. The Earth is enclosed in the magnetosphere, a hollow carved out of the solar wind by the Earth's magnetic field. Above the ionosphere there is a very tenuous thermal plasma of partially ionized hydrogen in diffusive equilibrium with magnetic and gravitational forces, and ener getic protons and electrons that constitute the trapped Van Allen ra diation belts. Throughout this anisotropic and inhomogeneous plasma, natural and man-made electromagnetic energy propagates in a wide variety of modes and frequency bands. This book is concerned with that class of natural signals called geomagnetic micropulsations-short period (usually of the order of seconds or minutes) fluctuations of the Earth's magnetic field.
Author: John A. Dawson
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 76
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Book Description
