Parametric interactions in a dielectric medium with second-harmonic space-time pump modulation
Parametric coupling between space-time harmonics of electromagnetic wave propagating in dielectrics modulated by pump wave
Rama Rao, B.↗
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Results for “ELECTROMAGNETIC PROPAGATION”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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The ionosphere and its interaction with satellites
Monograph on ionosphere-satellite interactions, discussing ionosphere layers, plasma sheaths and wakes, electromagnetic wave propagation, spacecraft antennas, etc
Kasha, M. A.↗
Random operator equations in mathematical physics. I
Stochastic differential equations objectives, limitations and restrictive assumptions in physical problems, discussing electromagnetic wave propagation in random continuum or random dAlembertian operator
Adomian, G.↗
Ordinary-mode electromagnetic instability in high-beta plasmas
Ordinary mode electromagnetic wave propagation instability in high beta plasma, determining lower bound on growth rate
Davidison, R. C.↗
Tracking and orbit determination
Investigating electromagnetic wave propagation in uniformly accelerated medium
Source record↗
Plasma physics experiments being proposed for space station
Space station plasma physics experiments, investigating electron and ion wakes, resonance, VLF electromagnetic energy propagation and magnetospheric phenomena
Roberts, W. T.↗
Measurement of general relativistic time delay with Mariner 6 and 7
General relativistic time delay of electromagnetic radiation propagation due to solar gravitational field measured from Mariner 6 and 7 range and Doppler data
Anderson, J. D.↗
Classical least squares and sequential estimation techniques as applied to the analysis of the Mariner VI and VII tracking data
Least squares and sequential estimation techniques application to Mariner 6 and 7 tracking data analysis, verifying Einstein relativity theory on electromagnetic radiation propagation
Anderson, J. D.↗
Probing atmospheric water vapor profiles via multiple scattering of electromagnetic waves
A theoretical analysis on the multiple scattering of electromagnetic waves propagating in a finite inhomogeneous medium is presented and applied to the study of wave propagation in a clear atmosphere (fine weather conditions). It is shown that the analysis offers a method of synthesizing the water vapor density profile in a clear atmosphere by measuring the resultant reflections from the density profile at several different frequencies. It is also shown that the resultant reflection emerges as the consequence of multiple scattering of partial reflections from various parts of the inhomogeneous medium. The solutions of the multiple scattering approach are shown to be more accurate than those of the WKB approach, which neglects the multiple scattering effects.
Tang, C. C. H.↗
A computer program to evaluate optical systems
A computer program is used to evaluate a 25.4 cm X-ray telescope at a field angle of 20 minutes of arc by geometrical analysis. The object is regarded as a point source of electromagnetic radiation, and the optical surfaces are treated as boundary conditions in the solution of the electromagnetic wave propagation equation. The electric field distribution is then determined in the region of the image and the intensity distribution inferred. A comparison of wave analysis results and photographs taken through the telescope shows excellent agreement.
Innes, D.↗
An impedance analysis of double-stream interaction in semiconductors
The electromagnetic waves propagating through a drifting semiconductor plasma are studied from a macroscopic point of view in terms of double-stream interaction. The possible existing waves (helicon waves, longitudinal waves, ordinary waves, and pseudolongitudinal waves) which depend upon the orientation of the dc external magnetic field are derived. A powerful impedance concept is introduced to investigate the wave behavior of longitudinal (space charge) waves or pseudolongitudinal waves in a semiconductor plasma. The impedances due to one- and two-carrier stream interactions were calculated theoretically.
Chen, P. W.↗
Ordinary electromagnetic mode instability
The instability of the ordinary electromagnetic mode propagating perpendicular to an external magnetic field is studied for a single-species plasma with ring velocity distribution. The marginal instability boundaries for both the purely growing mode and the propagating growing modes are calculated from the instability criteria. The dispersion characteristics for various sets of plasma parameters are also given. The typical growth rates are of the order of the cyclotron frequency.
Cheng, C. Z.↗
Effect of Faraday rotation on the circular polarization of the Crab Nebula
The effect of Faraday rotation on the circular polarization of an electromagnetic wave propagating through a magnetized plasma is calculated for various limits of the plasma and wave parameters appropriate to a 30-Hz wave in the Crab Nebula. It is shown that a static magnetic field of the proper geometry and only a few times stronger than the wave field can reduce the circular polarization of the nonlinear inverse Compton radiation to a value below the observed upper limit.-
Gerver, M. J.↗
Ordinary electromagnetic mode instability
The instability of the ordinary electromagnetic mode propagating perpendicular to an external magnetic field is analyzed for a single-species plasma with ring velocity distribution. The marginal instability boundaries for both the purely growing mode and the propagating growing modes are calculated from the instability criteria. The dispersion characteristics are derived for a cold plasma and a very strong static magnetic field. The point is determined at which the real parts of the complex frequency band are centered. The typical growth rates are found to be of the order of the cyclotron frequency and can be enhanced by increasing the ratio of parallel kinetic pressure to magnetic pressure.
Cheng, C.-Z.↗
The scattering of obliquely incident plane waves from a corrugated conducting surface
A physical optics solution is presented for the scattering of plane waves from a perfectly conducting corrugated surface in the case of waves incident from an arbitrary direction and for an observer far from the surface. This solution is used to compute the radar cross section of the surface in the case of backscatter from irregular (i.e., stochastic) corrugations. An interesting feature of the solution is the occurrence of singularities in the scattered fields. These singularities appear to be a manifestation of focusing by the surface at its 'stationary' points. Whether or not the singularities occur in the solution depends on the manner in which one restricts the analysis to the far-field.
Surface waves↗
Electromagnetic noise and radio wave propagation below 100 kHz in the Jovian atmosphere. I - The equatorial region
The Galileo satellite program includes the delivery of an entry probe to the Jovian equatorial atmosphere in mid-1985. Optical and RF sensors for a lightning detection system are included as a part of the probe experimental payload. In this paper, calculations of the RF wave propagation and reflection characteristics of the equatorial Jovian atmosphere and ionosphere for frequencies less than 100 kHz are presented. It is shown that wave propagation is limited to line-of-sight and one-hop from the ionosphere. Results are also presented of a statistical treatment of the RF wave power densities for the case of a finite number of events and for the case of a uniformly distributed source. The results can be applied to specific RF experiment configurations concerned with establishing the statistical characteristics of Jovian lightning.
Rinnert, K.↗
Modified radiative transfer theory for a two-layer random medium
Modified radiative transfer (MRT) equations appropriate for electromagnetic wave propagation in bounded random media are derived from the Bethe-Salpeter equation with the ladder approximation and the Dyson equation with the nonlinear approximation. The MRT equations are then solved with the first-order renormalization approximation to obtain analytical results for the backscattering cross sections of a two-layer random medium with arbitrary three-dimensional correlation functions. The coherent effects of the MRT theory are illustrated and comparisons are made with backscattering cross sections obtained with the first Born approximation to the wave equation.
Zuniga, M. A.↗
Scattering of electromagnetic waves from random media with strong permittivity fluctuations
By taking into account the singularity of the dyadic Green's function in the renormalization method, a theory is derived for vector electromagnetic wave propagation in a random medium with large permittivity fluctuations and with anisotropic correlation function. The strong fluctuation theory is then applied to a discrete scatterer problem in which the permittivity can assume only two values. The results are found to be consistent with those derived from discrete scatterer theory for all values of dielectric constants of the scatterers.
Tsang, L.↗