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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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Rocket observations of upper atmospheric winds, electron density, electron temperature, and neutral temperature in auroral region with Langmuir probes
Electron density, electron temperature, and earth magnetic field above Fort Churchill from rocket measurements
Lower E region recombination coefficients from electron density and flux measurements in glow aurora by Nike-Apache rocket
Electron density and temperature in inviscid flow and nozzle-wall boundary layer, measured with constant bias-voltage and swept-voltage RAM probes
Electron density and temperature distribution in boundary layer flow of reflected shock tunnel conical nozzle
Mathematical model for prediction of electron density at equilibrium
Ionospheric electron density profiles obtained by the cw propagation technique and by rf impedance probe techniques
Langmuir and current probe measurements of ion thrustor beam, and resulting transverse and longitudinal profiles of electron and ion densities
Spatial and temporal models used to study response of ionospheric electron density to change of electron temperature
Electron beam density probe calibration for earth atmospheric reentry vehicles communication
Electron density deviations from a basic variation with the solar zenith angle were investigated. A model study was conducted in which the effects of changes in neutral and relative densities of atomic and molecular oxygen on calculated electron densities were compared with incoherent scatter measurements in the height range 100-117 km at Arecibo, Puerto Rico. The feasibility of determining tides in the neutral atmosphere from electron density profiles was studied. It was determined that variations in phase between the density and temperature variation and the comparable magnitudes of their components make it appear improbable that the useful information on tidal modes can be obtained in this way.
Microwave electron density probe based on plasma- electromagnetic field interaction
D region electron density rocket measurements implying recombination coefficient
Unknown electron density profiles determined from electroacoustic resonance frequencies by WKB approximation
Electron-density profiles measured for the daytime and nighttime Jovian ionosphere by the Voyager 1 radio-science experiment are analyzed. It is found that the measured profiles can be reproduced by using a model appropriate for an exospheric temperature of 1300 K with temperature varying above the homopause and with an eddy diffusion coefficient of 100,000 to 300,000 sq cm/s at the homopause. An overall rate constant of 4.3 x 10 to the -16th cu cm/s is estimated for the reaction H(+) + H2 (v-prime at least 4) yields H2(+) + H.
Auroral ionospheric electron densities and temperatures, discussing electron density variation and electron heating by auroral secondaries
Reduction of ionograms to electron density profiles
Potential electron-density diagnostics for the high-temperature component of solar flares are studied with reference to the wavelength region from 171 to 630 A. The specific ions discussed include Fe IX through Fe XV, Ni XI through Ni XVII, and ions in the beryllium, boron, carbon, and nitrogen isoelectronic sequences. Line ratios that could be useful as density indicators under solar-flare conditions are indicated, available data for the ions considered are reviewed, and several theoretical intensity ratios are plotted. The results are employed to determine the electron-density distribution as a function of electron temperature for several spectra from two flares. For these flares it is found that the electron density increases from 10 billion to 500 billion per cu cm for a temperature increase from 1 million to 10 million K.