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Author: Allen G. Rubin
Publisher:
ISBN:
Category : Electromagnetic waves
Languages : en
Pages : 26
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Book Description
A theory of hydromagnetic ionizing waves has been developed which is valid in the region in which gas pressure is negligible, compared with magnetic pressure. The theory takes into account the energy expended in partial ionization of the gas behind the wave. The usual high conductivity boundary condition behind the wave is not employed. The electric field in front of the wave is taken as a parameter. Results of this theory are compared with available experimental measurements, and show good agreement. (Author).
Author: Allen G. Rubin
Publisher:
ISBN:
Category : Electromagnetic waves
Languages : en
Pages : 26
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Book Description
A theory of hydromagnetic ionizing waves has been developed which is valid in the region in which gas pressure is negligible, compared with magnetic pressure. The theory takes into account the energy expended in partial ionization of the gas behind the wave. The usual high conductivity boundary condition behind the wave is not employed. The electric field in front of the wave is taken as a parameter. Results of this theory are compared with available experimental measurements, and show good agreement. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
ABS>It is possible to generate plasma by passing a discharge between electrodes arranged such that the current is forced to flow across an initial strong magnetic field. The magnetic induction due to the discharge causes a bending of the original field. If the discharge is operated with a lowimpedance current source, electric breakdown starts in a limited region near the current- input connections and propagates as a well-defined front in the manner of a hydromagnetic shock wave. Such a shock is usually compressive, i.e. the sudden increase in temperature and ionization is usually accompanied by an abrupt onset of both transverse and longitudinal components of plasma flow. Consequently the front must be followed by a rarefaction wave in which the longitudinal flow is brought to rest. This phenomenon is analyzed as a one-dimensional single-fluid hydromagnetic problem, neglecting dissipation behind the wave. The assumptions are made of zero conductivity in front and thermodynamic equilibrium behind the wave. In the limit of essentially complete ionization behind the front, the problem can be solved analytically if the transverse magnetic field there remains small compared with the longitudinal field. In this case, the front velocity, plasma temperature and density, and the electric field behind the wave, as well as the structure of the rarefaction wave, can be ex pressed as simple functions of the initial magnetic field, the discharge current, the ionization energy, snd the initial gas density. Over a certain range of operating conditions, the electric field is relatively independent of the driving current and is primarily determined by the ionization energy per unit mass of the gas. Conditions are derived for noncompressive waves, hence also for production of uniform plasma. (auth).
Author: Allen G. Rubin
Publisher:
ISBN:
Category : Electromagnetic waves
Languages : en
Pages : 0
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Book Description
A theory of hydromagnetic ionizing waves has been developed which is valid in the region in which gas pressure is negligible, compared with magnetic pressure. The theory takes into account the energy expended in partial ionization of the gas behind the wave. The usual high conductivity boundary condition behind the wave is not employed. The electric field in front of the wave is taken as a parameter. Results of this theory are compared with available experimental measurements, and show good agreement. (Author).
Author: Ram S. Kushwaha
Publisher:
ISBN:
Category : Ionization
Languages : en
Pages : 30
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Book Description
The transverse hydromagnetic ionizing wave is studied theoretically without the assumption of infinite conductivity behind the wave. Finite gas pressures are included, as well as a variable degree of ionization behind the wave. The electric field in front of the wave is employed as a parameter. Jump conditions across the wave are solved. It is shown that finite pressure and variation of the degree of ionization are important in some regions. (Author).
Author: Alan Woodruff DeSilva
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 130
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Book Description
Author: DONALD H. MENZEL
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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Book Description
A review of the classical Bailey-Martyn theory of cross modulation (Luxembourg effect) is given. A theory is developed for electromagnetic waves in a plasma leading to a dispersion relation that depends explicitly on the velocity-distribution function f(q, t) of the electrons. The complex index of refraction is determined by the isotropic part, of, f, and a formula for the time independent part of f is derived. The time dependent part of the function is reduced to a problem of determining the solution of a pair of simultaneous second order differential equations. Next follows a detailed discussion of the coupled pair of (quasi hypergeometric) differential equations. The magnetohydrodynamic interaction of a partially ionized gas with electromagnetic waves is considered and the resulting dispersion relation illustrates the coupling between mechanical and electromagnetic waves. (Author).
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Category :
Languages : en
Pages : 0
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The objective of this research in magnetospheric physics was to advance understanding of the interaction of ring current ions with magnetospheric hydromagnetic waves. The goal was to examine the excitation of westward propagating hydromagnetic waves by drift-bounce resonance with 100 to 200 MeV ring current protons using a 3D MHD code in dipole geometry which incorporates the ring current ions via a gyrokinetic treatment. This was the first self-consistent study of this phenomenon. An extension of the ring current particle trajectory tracing code, developed with Air Force support, was used to study the rapid formation of new electron and proton radiation belts. The model has been highly successful at explaining the observed acceleration of electrons and protons by tens of MeV in less than a drift period.
Author: H.G. Booker
Publisher: Springer Science & Business Media
ISBN: 9789024729777
Category : Science
Languages : en
Pages : 382
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Book Description
The book aims to present current knowledge concerning the propagation of electro magnetic waves in a homogeneous magnetoplasma for which temperature effects are unimportant. It places roughly equal emphasis on the radio and the . hydromagnetic parts of the electromagnetic spectrum. The dispersion properties of a magnetoplasma are treated as a function both of wave frequency (assumed real) and of ionization density. However, there is little discussion of propagation in a stratified medium, for of collisions is included only which reference may be made to Budden [1] . The effect in so far as this can be done with simplicity. The book describes how pulses are radiated from both small and large antennas embedded in a homogeneous magneto plasma. The power density radiated from a type of dipole antenna is studied as a function of direction of radiation in all bands of wave frequency. Input reactance is not treated, but the dependence of radiation resistance on wave frequency is described for the entire electromagnetic spectrum. Also described is the relation between beaming and guidance for Alfven waves.
Author: Ram S. Kushwaha
Publisher:
ISBN:
Category : Ionization
Languages : en
Pages : 0
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Book Description
The transverse hydromagnetic ionizing wave is studied theoretically without the assumption of infinite conductivity behind the wave. Finite gas pressures are included, as well as a variable degree of ionization behind the wave. The electric field in front of the wave is employed as a parameter. Jump conditions across the wave are solved. It is shown that finite pressure and variation of the degree of ionization are important in some regions. (Author)
Author: David Edmund Smith
Publisher:
ISBN:
Category : Ionization of gases
Languages : en
Pages : 104
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Book Description
