Power coupling and wave fields of ion-cyclotron waves in a finite length system.
Wave fields and coupling of RF power to ion cyclotron waves in finite length thermal collisional plasma column
Reinmann, J. J.↗
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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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Interaction of linear waves with oblique shock waves.
Linear wave interaction with oblique shock waves, noting dependence of transmission, reflection and generation coefficients on Mach number
Mckenzie, J. F.↗
Interaction of magnetoacoustic and entropy waves with normal magnetohydrodynamic shock waves.
Amplitude equations for magnetoacoustic and entropy waves diverging from normal MHD shock, obtaining energy flux ratios associated with incident and transmitted waves
Mckenzie, J. F.↗
On the motion and radiation of charged particles in strong electromagnetic waves. 1 - Motion in plane and spherical waves
Motion and radiation of charged particles in strong electromagnetic waves in plane and spherical waves
Gunn, J. E.↗
Electromagnetic wave propagation in a lossy plasma slab with a gradient transverse to the incident wave
Computer solution of plane electromagnetic wave interaction with bounded inhomogeneous plasma slab with electron density gradient transverse to wave
Gal, G.↗
Interpretation of vertical wave patterns in the winter atmosphere at high latitudes in terms of gravity wave theory
Interpretation of vertical wave patterns in winter atmosphere at high latitudes in terms of gravity waves theory
Eberstein, I. J.↗
Effect of ionospheric heating by radio waves on the absorption of probing waves of different polarization
Radio wave ionospheric heating effect on absorption of probing waves of different polarization
Fejer, J. A.↗
Similarities between ion waves in plasmas and gravity waves in incompressible fluids
Similarities between ion waves in plasmas and gravity waves in incompressible fluid /steady water flow with allowance for surface tension/
Lam, S. H.↗
Radio wave propagation at frequencies exceeding MUF-F2 in the short wave band
The results of measurements of field strength and signal/noise ratio on experimental ionospheric-scattering short wave radio links are presented. It is shown that the seasonal and diurnal variations of field strength are determined by features of solar and meteoric activity. The role of the sporadic E-layer in propagation of short radio waves at frequencies exceeding MUF-F2 is noted.
Ashkaliyev, Y. F.↗
Application of Monochromatic Ocean Wave Forecasts to Prediction of Wave-Induced Currents
Stoke's wave-induced currents are compared, for variety of wind conditions resulting in partially developed seas and for two water depths, with currents induced by average and significant monochromatic waves related to Bretschneider spectrum.
Poole, L. R.↗
Measurements of wave height statistics and radar, cross-section in a wind wave tank
There is currently wide interest among oceanographers and meteorologists in remote sensing of ocean surface characteristics. A wind wave tank developed at Langley Research Center is used to evaluate various remote sensing techniques based on electromagnetic scattering phenomena, and in the development and evaluation of theoretical scattering models. The wave tank is described, the statistics of the rough water surface are documented, and microwave radar cross-section measurement results are presented. The water surface statistics are similar in key respects to the open ocean, and the microwave scattering measurements show, qualitatively, theoretically predicted large and small scale scattering effects.
Johnson, J. W.↗
Computational study of nonlinear plasma waves. I - Simulation model and monochromatic wave propagation. II - Sideband instability and satellite growth
A hybrid plasma simulation model is described and applied to the study of electrostatic wave propagation in a one-dimensional Maxwellian plasma with periodic boundary conditions. The model employs a cloud-in-cell scheme which can drastically reduce the fluctuations in particle simulation models and greatly ease the computational difficulties of the Vlasov equation approach. A grid in velocity space is introduced and the particles are represented by points in the x-v phase space. The model is tested first in the absence of an applied signal and then in the presence of a small-amplitude perturbation. The method is also used to study propagation of an essentially monochromatic plane wave. Results on amplitude oscillation and nonlinear frequency shift are compared with available theories.
Matsuda, Y.↗
Form-drag instability, multiple equilibria and propagating planetary waves in baroclinic, orographically forced, planetary wave systems
A two-layer baroclinic model is used to study the planetary-scale motions of a thermally driven atmosphere in the presence of topography, and in doing so to extend previous results obtained with a barotropic model. Highly truncated spectral equations are used to obtain multiple wavelike stationary equilibrium states, to examine the instabilities that produce them, and to study the instabilities that feed on them and give rise to traveling planetary waves. Although the equilibria cannot exist without orography, their energy comes from the potential energy of the mean flow, not from kinetic energy transfer via the mountain torque. Low-index (blocking) equilibria as well as high-index equilibria require a large thermal driving and are associated with both orographic and baroclinic instability of the Hadley circulation. It is suggested that blocking in nature is a quasi-stable circulation arising from orographic instability with strong thermal driving; and that observed low-frequency, propagating planetary waves are due to instabilities of the quasi-stationary, topographically forced equilibria.
Charney, J. G.↗
Contamination of the fetch-limited directional wave spectrum by waves emanating from an embayment
The Surface Contour Radar (SCR) was used to map the evolution of the fetch-limited directional wave spectrum (DWS) off the eastern seaboard. Flight lines were displaced both north and south of the Delaware Bay following the passing of a weather front. The near shore DWS was found to be dominated by waves emanating from the Delaware Bay for distances of at least 85 km up the coastline and out to sea for 200 km from the mouth of the bay.
Walsh, E. J.↗
Contamination of the fetch-limited directional wave spectrum by waves emanating from an embayment
The Surface Contour Radar (SCR) has been used to map the evolution of the fetch-limited directional wave spectrum (DWS) off the eastern seaboard. Flight lines were displaced both north and south of the Delaware Bay following the passing of a weather front. The near shore DWS was found to be dominated by waves emanating from the Delaware Bay for distances of at least 85 km up to the coastline and out to sea for 200 km from the mouth of the bay.
Walsh, E. J.↗
The wave magnetic field amplitude threshold for nonlinear trapping of energetic gyroresonant and Landau resonant electrons by nonducted VLF waves in the magnetosphere
A recently developed theory is used to calculate the wave magnetic field amplitude threshold, B-tau, necessary to allow the nonlinear trapping of energetic gyroresonant and Landau resonant electrons by VLF whistler mode waves in the magnetosphere propagating at an arbitrary angle, psi, with respect to the earth's magnetic field. A detailed raytracing study is carried out to establish the variation of psi with position along each magnetic shell in the range L = 2-5 and for frequencies 5-17.8 kHz. It is found that the minimum values of B-tau along each L shell generally occur at points of second-order resonance. In general, for nonducted fixed frequency signals there is only one point of second-order resonance on each L shell, and this is located within a few degrees of the magnetic equator. However, over a narrow range of L, there are as many as three points of second-order resonance and as many as three associated minima in B-tau. At least one of these points is located more than 10 deg from the magnetic equator.
Bell, T. F.↗
Mesospheric wave number spectra from Poker Flat MST radar measurements compared with gravity-wave model
The results of a comparison of mesospheric wind fluctuation spectra computed from radial wind velocity estimates made by the Poker Flat mesosphere-stratosphere-troposphere (MST) radar are compared with a gravity-wave model developed by VanZandt (1982, 1985). The principal conclusion of this comparison is that gravity waves can account for 80% of the mesospheric power spectral density.
Smith, S. A.↗
The physical basis for estimating wave-energy spectra with the radar ocean-wave spectrometer
The derivation of the reflectivity modulation spectrum of the sea surface for near-nadir-viewing microwave radars using geometrical optics is described. The equations required for the derivation are presented. The derived reflectivity modulation spectrum provides data on the physical basis of the radar ocean-wave spectrometer measurements of ocean-wave directional spectra.
Jackson, Frederick C.↗