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Author: M. P. BACHYNSKI Publisher: ISBN: Category : Languages : en Pages : 164
Book Description
An experimental and theoretical investigation of the propagation of electromagnetic waves in an anisotropic plasma along the direction of the applied static magnetic field was conducted. Experimental measurements of electron density and attenuation using circularly polarized waves (left-hand or right-hand) show good agreement with theory and with each other over all ranges of parameters. For the right-hand mode at radio frequencies above the electron cyclotron frequency, 'cut-off' occurs at much lower electron densities than in the absence of a magnetic field. For the left-hand wave, both the phase change and attenuation decrease with magnetic field and the wave is affected much less by the plasma than the right-hand wave over the range of parameters encountered in the experiments. The theory of propagation of a linearly polarized wave in a lossy anisotropic plasma was derived. Investigations of the collisional effects on e-m wave propagation in the region of the electron cyclotron frequency show a reversal in phase of the wave passing through the plasma as the electron density is increased. This phenomenon occurs only for the right-hand circularly polarized wave at frequencies very near but just above the electron cyclotron frequency. Collisional effects based on cold plasma theory can account for this behavior.
Author: M. P. BACHYNSKI Publisher: ISBN: Category : Languages : en Pages : 164
Book Description
An experimental and theoretical investigation of the propagation of electromagnetic waves in an anisotropic plasma along the direction of the applied static magnetic field was conducted. Experimental measurements of electron density and attenuation using circularly polarized waves (left-hand or right-hand) show good agreement with theory and with each other over all ranges of parameters. For the right-hand mode at radio frequencies above the electron cyclotron frequency, 'cut-off' occurs at much lower electron densities than in the absence of a magnetic field. For the left-hand wave, both the phase change and attenuation decrease with magnetic field and the wave is affected much less by the plasma than the right-hand wave over the range of parameters encountered in the experiments. The theory of propagation of a linearly polarized wave in a lossy anisotropic plasma was derived. Investigations of the collisional effects on e-m wave propagation in the region of the electron cyclotron frequency show a reversal in phase of the wave passing through the plasma as the electron density is increased. This phenomenon occurs only for the right-hand circularly polarized wave at frequencies very near but just above the electron cyclotron frequency. Collisional effects based on cold plasma theory can account for this behavior.
Author: Vitaliĭ Lazarevich Ginzburg Publisher: Pergamon ISBN: Category : Science Languages : en Pages : 650
Book Description
"Much attention has been given also to various sepecific problems, in particular the propagation and generation of waves in the Earth's ionosphere and magnetosphere, in the interplanetary plasma, and in laboratory apparatus, as well as solid-state plasmas." -- p. xiii.
Author: Morrel P. Bachynski Publisher: ISBN: Category : Languages : en Pages : 153
Book Description
A series of investigations on 'Strong Field Electromagnetic Wave Interaction with Anisotropic Plasmas' has been carried out. The major accomplishments include: Formulation of a theory of conductivity for a slightly ionized plasma; Development of plasma diagnostic techniques; Measurement of strong field, e-m wave interaction with anisotropic plasmas; Measurement of strong field, e-m waves in anisotropic plasmas; Discovery of enhanced transmission at high electron densities in the region of electron cyclotron resonance; Experimental results which do not support the theory on the effect of an electrostatic field on e-m wave propagation in a plasma; Distortion of amplitude modulated e-m waves transmitted through a plasma; and An absolute measurement of plasma density by propagation of e-m waves at small angles to the magnetic field direction. (Author).
Author: Dikshitulu K. Kalluri Publisher: CRC Press ISBN: 9780849325229 Category : Technology & Engineering Languages : en Pages : 320
Book Description
Recent advances in the fields of materials science and electromagnetics indicate that materials can be synthesized with any desired electromagnetic properties. Electromagnetics of Complex Media provides the appropriate understanding of optimum properties for a given application, addressing the needs of researchers who study electromagnetics as a base for those disciplines using complex materials. Examples include electrooptics, plasma science and engineering, microwave engineering, and solid state devices.The book emphasizes these aspects: Dispersive medium Tunneling of power through a plasma slab by evanescent waves Characteristic waves in an anisotropic medium Transient medium and frequency shifting Green's function for unlike anisotropic media Perturbation technique for unlike anisotropic media Adiabatic analysis for modified source wave All of the above topics use one-dimensional models. Brief discussions also include chiral media, surface waves, and periodic media. The text focuses on bringing out the major effects due to each kind of complexity in the medium properties. A plasma column in the presence of a static magnetic field is at once dispersive, anisotropic, and inhomogeneous - thus the author uses plasma as the basic medium to illustrate some aspects of the transformation of an electromagnetic wave by a complex medium. Early chapters use a mathematical model that usually has one kind of complexity. The medium is often assumed to be unbounded in space or has a simple plane boundary. The field variables and the parameters are often assumed to vary in one spatial coordinate. This eliminates the use of heavy mathematics and permits the focus to be on the effect. Electromagnetics of Complex Media aims to stimulate experimental and additional theoretical and numerical work on the effects that can be obtained by the temporal and spatial modification of the magnetoplasma parameters. The book also provides the new researcher with a quick primer into the theory of using magnetoplasmas for the coherent generation of tunable radiation.
Author: RADIO CORP OF AMERICA MOORESTOWN N J. Publisher: ISBN: Category : Languages : en Pages : 1
Book Description
A study was made of electromagnetic properties of homogeneous anisotropic plasmas. The propagation characteristics of electromagnetic waves in anisotropic plasmas are examined for propagation parallel to and perpendicular to the applied d-c magnetic field. The existence of very low frequency pass-bands due to ion effects is noted. Faraday rotation due to the earth's magnetic field is considered for the ionosphere and the plasma sheath of a re-entry vehicle. A generalized and exact form of Kirchhoff's law is used to obtain the absorptivity of a plasma from its electromagnetic properties. The absorptivity of an isotropic and anisotropic plasma slab is computed for normal incidence and the effects of electron collision frequency, slab thickness, stop-bands and boundary effects on the radiation spectrum is presented. (Author).
Author: M. P. Bachynski Publisher: ISBN: Category : Languages : en Pages : 40
Book Description
The reflection of both right-hand and left-hand circularly polarized plane electromagnetic waves, normally incident along the direction of an imposed static magnetic field in an anisotropic plasma, was investigated. Detailed measurements at a frequency of 9.2 Gc of the intensity and phase of the wave reflected from a helium afterglow plasma over wide ranges of plasma frequency and electron cyclotron frequency were carried out. The measured reflected power varied from less than one percent of the incident power to complete reflection and large undulations in both intensity and phase of the reflected wave with changing electron density and magnetic field were observed. Comparison with theory based on a simple sharply bounded uniform plasma slab shows good agreement for the general nature of the dependence of the reflected wave on the plasma properties. The exact electron densities corresponding to the maxima and minima and the absolute values of the intensity and phase of the reflected wave are not accurately predicted by this simple theoretical model. In the region of the electron cyclotron frequency, for an incident right-hand circularly polarized wave, the reflected signal undergoes a reduced variation in phase and the intensity after attaining a maximum is observed to decrease with increasing electron density. (Author).
Author: M. P. BACHYNSKI
Author: M. P. BACHYNSKI
Author: Vitaliĭ Lazarevich Ginzburg
Author: Morrel P. Bachynski
Author: Dikshitulu K. Kalluri
Author: V. N. Gershman
Author: Basant R. Chawla
Author: Laurence S. Hall
Author: RADIO CORP OF AMERICA MOORESTOWN N J.
Author: United States. National Bureau of Standards
Author: M. P. Bachynski