Ion distribution and temperature in the topside ionosphere obtained from the Alouette satellite
Ion distribution and temperature of topside ionosphere from electron density measurements by Alouette satellite
IONOSPHERIC ELECTRON DENSITY↗
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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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X-ray spectra of several cosmic sources.
X-ray spectral distributions and fluxes in low kev range of five cosmic sources at low galactic latitude and longitude, noting effective temperature
RADIATION DETECTOR↗
Ring current particle distributions derived from ring current magnetic field measurements
Distribution of particle energy density in ring current field of magnetic storm
Cahill, L. J., Jr.↗
On the statistics of correlator outputs
Characteristic function, probability density function, and probability distribution function computations for correlation detector output, and correlator output statistics
Wintz, P. A.↗
Topside ionosphere of Venus and its interaction with the solar wind
Solar wind and Venus topside ionosphere interaction, discussing charged particle density, temperature and pressure distribution
Bauer, S. J.↗
Photoemission studies of the noble metals. II - Gold
Photoemission from evaporated gold films, measuring quantum yield, photoelectric energy distribution curves and optical density states
Krolikowski, W. F.↗
Technique for measuring time-base errors of magnetic instrumentation recorders/reproducers
Time-base error analysis of magnetically recorded and played back digital data using tape flutter spectral density and amplitude probability distribution measurements and rms time plots
Chan, R. J.↗
Spectral analysis of four quiescent prominences observed at the Peruvian eclipse
Spectral analysis of solar prominences observed during Peruvian eclipse of 12 November 1966, obtaining two dimensional distribution of kinetic temperature, density and turbulent velocity
Hirayama, T.↗
Plasma model for thermal X-ray sources
Thermal X ray sources associated with rotating collapsed stars with surrounding plasma shells, discussing plasma density profile and electron distribution in stellar magnetosphere
Coppi, B.↗
UV and radiofrequency observations of Wolf-Rayet stars
Observations of W stars in the ultraviolet by OAO 2 and at 750 and 1400 MHz with the Green Bank telescopes are discussed. The emphasis is on the Green Bank observations of W stars with symmetric nebulae around them, their interpretation, and comparisons with other data. The implications regarding mass distribution, internal motion, flux density, ejected mass, velocity dispersion, and expanding envelopes are considered in detail.
Johnson, H. M.↗
The global hydrogen budget
Experimental results, based on Explorer 32 data, on the density, temporal variation, and distribution of atomic hydrogen in the atmosphere are reported.
Brinton, H. C.↗
On the probability of cycle-slipping in first-order phase-locked loops.
The first-passage time boundary value problem for first-order phase-locked loops (PLL) is analyzed, and spectral representations are developed for the probability density function (pdf), the distribution function, and the moments of the first time to passage (or cycle-slip). For the sinusoidal PLL, an asymptotic formula, that is surprisingly accurate even at low loop SNR's and large frequency offsets, is obtained for the pdf of the time to cycle-slip, in terms of the mean time to slip.
La Frieda, J. R.↗
Computer program calculates quasi-one-dimensional flow across face seals and narrow slots
Program calculates mass and volume leakage across seal; mean friction factor; force; center of pressure; and distributions of pressure, temperature, density, friction parameter, velocity, and Mach number across seal for both laminar flow and turbulent flow regimes and for choked and subsonic flow.
Zuk, J.↗
Electron observations in the solar wind and magnetosheath.
Electron temperature measurements taken by a triaxial electron analyzer on Ogo 5 in the solar wind and in the magnetosheath are interpreted. In the interplanetary medium, observations made on the bow shock connected lines of magnetic force have been separated from those made on non-bow-shock connected lines. The dependence of electron thermal properties on the local field geometry is discussed together with features of electron temperature and density discontinuities across the bow shock. The velocity distribution function is characterized together with temperature and density variations in a part of the dawn magnetosheath.
Scudder, J. D.↗
A numerical calculation of outward propagation of solar disturbances
The responses of the solar atmosphere due to an outward propagation shock are examined by employing the Lax-Wendroff method to solve the set of nonlinear partial differential equations in the model of the solar atmosphere. It is found that this theoretical model can be used to explain the solar phenomena of surge and spray. A criterion to discriminate the surge and spray is established and detailed information concerning the density, velocity, and temperature distribution with respect to the height and time is presented. The complete computer program is also included.
Wu, S. T.↗
The response of rotating machinery to external random vibration
A high-speed turbogenerator employing gas-lubricated hydrodynamic journal and thrust bearings was subjected to external random vibrations for the purpose of assessing bearing performance in a dynamic environment. The pivoted-pad type journal bearings and the step-sector thrust bearing supported a turbine-driven rotor weighing approximately twenty-one pounds at a nominal operating speed of 36,000 rpm. The response amplitudes of both the rigid-supported and flexible-supported bearing pads, the gimballed thrust bearing, and the rotor relative to the machine casing were measured with capacitance type displacement probes. Random vibrations were applied by means of a large electrodynamic shaker at input levels ranging between 0.5 g (rms) and 1.5 g (rms). Vibrations were applied both along and perpendicular to the rotor axis. Response measurements were analyzed for amplitude distribution and power spectral density. Experimental results compare well with calculations of amplitude power spectral density made for the case where the vibrations were applied along the rotor axis. In this case, the rotor-bearing system was treated as a linear, three-mass model.
Tessarzik, J. M.↗
Some early results from the ATS-6 radio beacon experiment
The multifrequency satellite radio beacon enables the measurement of the columnar electron content of the ionosphere and plasmasphere along the ray path and its spatial and temporal structure. Measurements include modulation phase, Faraday rotation, and amplitude. The characteristics of the beacon transmitter and its design are presented together with the design of the Boulder receiver and antennas and the calibration procedures. A shape factor F is defined which depends on the electron density and geomagnetic field distributions. It is found that F varies by about 30% from day to night. It is shown that the ratio of the plasmaspheric content to total content varies from about 0.08 during the day to about 0.35 at night. Other examples which are presented to illustrate the uses of the radio beacon include sunrise effects, solar flare enhancements of total content, and the ionospheric storms of early July 1974.
Davies, K.↗
Review of data analysis procedures for the ATS-6 millimeter wave experiment
Predictions of satellite downlink attenuation through the use of ground based measurements form a substantial part of the ATS-6 millimeter wave experiment (MWE). At the downlink frequencies (20 and 30 GHz), the major causes of attenuation are the density and the size distribution of rain drops along the propagation path. Ground station data, which include radar and rain gauge records, measure quantities related to the meteorological parameters of interest and thereby provide a prediction of downlink attenuation with which the measured attenuation can be compared. The calibration and data analysis procedures used in the MWE are reviewed with the object of improving the accuracy of such ground based predictions.
Meneghini, R.↗