291
291
May 31, 2011
05/11
by
Tomek, W. G.; Hall, R. M.; Wahls, R. A.; Luckring, J. M.; Owens, L. R
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eye 291
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A wind tunnel test of a generic fighter configuration was tested in the National Transonic Facility through a cooperative agreement between NASA Langley Research Center and McDonnell Douglas. The primary purpose of the test was to assess Reynolds number scale effects on a thin-wing, fighter-type configuration up to full-scale flight conditions (that is, Reynolds numbers of the order of 60 million). The test included longitudinal and lateral/directional studies at subsonic and transonic...
Topics: PLASMA ETCHING, SEMICONDUCTORS (MATERIALS), ION DENSITY (CONCENTRATION), CHLORINE, SILICON, WAFERS
242
242
Jun 21, 2010
06/10
by
Porodnov, B. T., et al
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Hydrogen, deuterium, and inert gas flow between parallel plates
Topics: PRESSURE SENSORS, ULTRAHIGH VACUUM, DEGASSING, ION DENSITY (CONCENTRATION), MEASURING INSTRUMENTS
593
593
Jul 12, 2010
07/10
by
Gross, R. S
texts
eye 593
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A sound data base was established by analytically and experimentally generating basic regenerative cooling, combustion performance, combustion stability, and combustion chamber heat transfer parameters for LOX/HC propellants, with specific application to second generation orbit maneuvering and reaction control systems (OMS/RCS) for the Space Shuttle Orbiter.
Topics: IONOSPHERIC SOUNDING, ISIS SATELLITES, UPPER IONOSPHERE, BACKSCATTERING, COMPARISON, DIFFUSION, ION...
294
294
May 27, 2011
05/11
by
Nguyen, Duc T
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eye 294
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Subspace and Lanczos iterations have been developed, well documented, and widely accepted as efficient methods for obtaining p-lowest eigen-pair solutions of large-scale, practical engineering problems. The focus of this paper is to incorporate recent developments in vectorized sparse technologies in conjunction with Subspace and Lanczos iterative algorithms for computational enhancements. Numerical performance, in terms of accuracy and efficiency of the proposed sparse strategies for Subspace...
Topics: ION DENSITY (CONCENTRATION), MASS SPECTROMETERS, SOLAR X-RAYS, PAYLOADS, OXYGEN ATOMS, AURORAS,...
178
178
Jul 10, 2010
07/10
by
DESALOS, J.; PORTENEUVE, J.; VIDAL, S.; SOUFFLOT, A.; OLIVIE, M
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SEVERAL SOLUTIONS ARE PROPOSED FOR LUMINOUS SMALL-FIELD SPECTROPHOTOMETRY AT 1025A. THE USE OF A SPECIALLY DESIGNED HOLOGRAPHIC GRATING PERMITS ADAPTING IT TO AN IMPOSED GEOMETRY. THE RESULTS OBTAINED ARE REPORTED.
Topics: CATHODES, ELECTRON EMISSION, FIELD EMISSION, ION CURRENTS, ION DENSITY (CONCENTRATION), PERFORMANCE...
375
375
Jul 10, 2010
07/10
by
WORTMANN, F. X
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eye 375
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INSECT-INDUCED ROUGHNESS ON AIRCRAFT CAN BE AVOIDED BY HIGHLY ELASTIC RUBBER COVERINGS ON WING AND CONTROL SURFACE LEADING EDGES. FILM PHOTOGRAPHS HAVE SHOWN THAT SUCH ELASTIC SURFACES CAN ELASTICALLY REFLECT IMPACTING INSECTS OR VISCOUS LIQUID DROPS. THIS PREVENTS THE FORMATION OF INSECT ROUGHNESS AND THE ENDANGERED FUSELAGE AND WING LEADING EDGES REMAIN SMOOTH.
Topics: ELECTRICAL RESISTIVITY, INHOMOGENEITY, ION EXCHANGE MEMBRANE ELECTROLYTES, ION DENSITY...
184
184
Jun 21, 2010
06/10
by
NON
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eye 184
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No Abstract Available
Topics: DISTURBANCES, PRESSURE, FLOW DISTRIBUTION, ION TEMPERATURE, LINEARITY, SOLIDS, COLLISIONLESS...
EXOS is the charged-particle spectrometer on EXOCUBE that will measure the H/He/O and H+ /He+ /0+ densities and temperatures in the exosphere. Its basic approach is based on WINCS; however, EXOS gave the impetus for improvements that led to the 2nd generation WINCS. Beginning with a brief description of the WINCS methodology for ionosphere-thermosphere measurements, lessons learned from the first generation WINCS are summarized as introduction to the design of EXOS. The EXOS design is then...
Topics: NASA Technical Reports Server (NTRS), CHARGED PARTICLES, ION DENSITY (CONCENTRATION),...
The operation of a subsonic, Gerdien condenser probe for in situ measurements of the mesosphere and stratosphere is presented. The inclusion of a flashing Lyman alpha ultraviolet source provides an artifically produced ionization of particular constituents. Detailed theory of operation is presented and the data results from two flights are shown. A great deal of fine structure in mobility is observed due to the presence of various hydrated positive ions. The effect of the Lyman alpha source in...
Topics: NASA Technical Reports Server (NTRS), MESOSPHERE, STRATOSPHERE, ION DENSITY (CONCENTRATION), LYMAN...
The entropy instability squared is a nonisothermal effect which is eliminated by parallel ion pressure at high densities (k sub z lambda sub e 1/2 sq root of m/M), reducing previous growth rate estimates and the range of unstable parameters.
Topics: NASA Technical Reports Server (NTRS), ENTROPY, ION DENSITY (CONCENTRATION), INDEPENDENT VARIABLES,...
The characteristics of the storm time ring current ions in the energy range of 0.5 to 16 keV were investigated. Data were processed and analyzed from the energetic ion mass spectrometer aboard the S3-3 satellite. Results are used for planning and operating the ion mass spectrometer experiment on the ISEE spacecraft, for selecting and processing the ISEE ion data, and for planning and conducting coordinated satellite experiments in support of the International Magnetospheric Study (IMS). It is...
Topics: NASA Technical Reports Server (NTRS), ION DENSITY (CONCENTRATION), MAGNETIC STORMS, RING CURRENTS,...
259
259
Jul 11, 2010
07/10
by
Brody, P. S
texts
eye 259
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The short-circuit currents and photo-emfs were measured for various ceramics including barium titanate, lead metaniobate, and lead titanate. It is suggested that the emfs and currents arise from the presence of photoconductor-insulator sandwiches in the presence of space-charge-produced internal fields. Results are in agreement with the proposed theory and indicate that the ferroelectric ceramics are not only producers of high-voltage photoelectricity but a photo-battery, the polarity and...
Topics: DIELECTRICS, ENERGY DISTRIBUTION, FILMS, ION DENSITY (CONCENTRATION), ION TRAPS (INSTRUMENTATION),...
No abstract available
Topics: NASA Technical Reports Server (NTRS), HISTOGRAMS, ION DENSITY (CONCENTRATION), ION TEMPERATURE,...
247
247
Aug 2, 2010
08/10
by
Yamaguchi, K.; Hansman, R. John, Jr.; Kazmierczak, Michae
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eye 247
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The focus here is on a deterministic model of the surface roughness transition behavior of glaze ice. The initial smooth/rough transition location, bead formation, and the propagation of the transition location are analyzed. Based on the hypothesis that the smooth/rough transition location coincides with the laminar/turbulent boundary layer transition location, a multizone model is implemented in the LEWICE code. In order to verify the effectiveness of the model, ice accretion predictions for...
Topics: CHARGE TRANSFER, LOSSES, HOLES (ELECTRON DEFICIENCIES), ION DENSITY (CONCENTRATION), ION...
Topics: NASA Technical Reports Server (NTRS), EARTH IONOSPHERE, ESA SATELLITES, ION DENSITY...
213
213
Jun 13, 2011
06/11
by
Stackhouse, Paul W., Jr.; Whitlock, C. H.; Chandler, W. S.; Hoell, J. M.; Zhang, T.; Mikovitz, J. C.; Leng, G. S.; Lilienthal, P
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Improvements to NASA Surface Meteorology and Solar Energy (SSE) web site are now being made through the Prediction of Worldwide Energy Resource (POWER) project under NASA Science Mission Directorate Applied Science Energy Management Program. The purpose of this project is to tailor NASA Science Mission results for energy sector applications and decision support systems. The current status of SSE and research towards upgrading estimates of total, direct and diffuse solar irradiance from NASA...
Topics: SOLAR WIND, MISSION PLANNING, SOLAR SYSTEM, HELIUM, HYDROGEN, HYDROGEN IONS, HELIUM IONS, ION...
The characteristics of out-flowing ions have been investigated under various circumstances. In particular the upwelling of ions from the cleft region has been studied to attempt to look at source characteristics (e.g., temperature, altitude). High altitude (6-8 Re) data tend to show ions species that have the same velocity and are adiabatically cooled. Such ions, while representative of their source, can not provide an accurate picture. Ion observations from the TIDE detector on the Polar...
Topics: NASA Technical Reports Server (NTRS), OUTLET FLOW, VELOCITY DISTRIBUTION, ION DISTRIBUTION, ION...
Measurements of precipitating protons and light ion densities by experiments on OGO-4 indicate that widespread proton precipitation occurs in predawn hours during the magnetic storm initial phase from the latitude of the high-latitude ion trough, or plasmapause , up to Lambda 75 deg. A softening of the proton spectrum is apparent as the plasmapause is approached. The separation of the low-latitude precipitation boundaries for 7.3 kev and 23.8 kev protons is approximately 1 deg, compared with a...
Topics: NASA Technical Reports Server (NTRS), ION DENSITY (CONCENTRATION), MAGNETIC STORMS, POLAR REGIONS,...
Electric potentials for two dimensional cross sections of ion focusing devices used in a mass spectrometer are calculated via a series of computer programs designed to compute potentials between areas of fixed voltages. Ion trajectories within these devices may be determined by computer and a histogram obtained which plots ion density against ion position along a plate of the focusing device. For each lens system, a plate voltage may be changed, the electric potentials recalculated, and a new...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, HISTOGRAMS, ION DENSITY (CONCENTRATION),...
465
465
Jul 23, 2010
07/10
by
Knoll, Richard H.; Macneil, Peter N.; England, James E
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eye 465
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The thermal protection systems for the shuttle/Centaur would have had to provide fail-safe thermal protection during prelaunch, launch ascent, and on-orbit operations as well as during potential abort. The thermal protection systems selected used a helium-purged polyimide foam beneath three rediation shields for the liquid-hydrogen tank and radiation shields only for the liquid-oxygen tank (three shields on the tank sidewall and four on the aft bulkhead). A double-walled vacuum bulkhead...
Topics: BRIGHTNESS, ION TEMPERATURE, SULFUR, IMAGING TECHNIQUES, IO, PLASMA HEATING, SPACE PLASMAS,...
338
338
Jul 12, 2010
07/10
by
Castleberry, D. E.; Mcelreath, M. Y
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eye 338
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In the design of a HH-65A helicopter cockpit, advanced integrated electronics systems technology was employed to achieve several important goals for this multimission aircraft. They were: (1) integrated systems operation with consistent and simplified cockpit procedures; (2) mission-task-related cockpit displays and controls, and (3) reduced pilot instrument scan effort with excellent outside visibility. The integrated avionics system was implemented to depend heavily upon distributed but...
Topics: HARMONIC MOTION, ION CHARGE, HEAVY IONS, ION DENSITY (CONCENTRATION), IONIC COLLISIONS, PAULI...
An ion mass spectrometer (IMS) was refurbished, calibrated and supplied to the University of Colorado payload (Dr. Charles Barth, P.I.) which was launched from White Sands in September of 1993 as NASA 33.062. The nose cone failed to deploy and their were problems with the ACS so the mission was declared a failure. However, the door covering the IMS deployed and the instrument obtained data. The launch occurred shortly after a payload carrying solar x-ray detectors was launched. Thus a small...
Topics: NASA Technical Reports Server (NTRS), ION DENSITY (CONCENTRATION), MASS SPECTROMETERS, SOLAR...
An important modification was made in the method for computing ion densities from DE1/RIMS observations, based on the observed relationship between total plasma density and spacecraft potential. An iterative technique was developed to require that this relationship be preserved in all individual observations, not just in the average sense observed. Results of employing this technique were examined closely and are found to generally improve the final densities in terms of agreement with...
Topics: NASA Technical Reports Server (NTRS), ION DENSITY (CONCENTRATION), MATHEMATICAL MODELS, SPACE...
Cesium-filled thermionic energy converters are examined as candidate electrical energy sources in spacecraft requiring tens to hundreds of kilowatts of electric power. The high operating temperatures necessary for a large specific power and high efficiency inevitably impose stringent constraints on the converter fabrication to achieve the desired reliability of the power system. The converter physics for reducing operating temperatures and cesium plasma losses are studied to achieve high...
Topics: NASA Technical Reports Server (NTRS), CESIUM PLASMA, ELECTRON ENERGY, ION DENSITY (CONCENTRATION),...
287
287
Jun 1, 2011
06/11
by
Ippolito, Corey; Plice, Laura; Pisanich, Gre
texts
eye 287
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The BEES (Bio-inspired Engineering for Exploration Systems) for Mars project at NASA Ames Research Center has the goal of developing bio-inspired flight control strategies to enable aerial explorers for Mars scientific investigations. This paper presents a summary of our ongoing research into biologically inspired system designs for control of unmanned autonomous aerial vehicle communities for Mars exploration. First, we present cooperative design considerations for robotic explorers based on...
Topics: MATHEMATICAL MODELS, MAGNETIC DISTURBANCES, WAVE-PARTICLE INTERACTIONS, KINETIC EQUATIONS, ION...
564
564
May 24, 2011
05/11
by
NONE, et al
texts
eye 564
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The Sixth Annual JPL Airborne Earth Science Workshop, held in Pasadena, California, on March 4-8, 1996, was divided into two smaller workshops:(1) The Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) workshop, and The Airborne Synthetic Aperture Radar (AIRSAR) workshop. This current paper, Volume 2 of the Summaries of the Sixth Annual JPL Airborne Earth Science Workshop, presents the summaries for The Airborne Synthetic Aperture Radar (AIRSAR) workshop.
Topics: ION DENSITY (CONCENTRATION), HIGH ALTITUDE, EXPLORER 55 SATELLITE, EDGES, CONFINEMENT, BUBBLES,...
The goal of this research has been to study the effects of electrons on magnetotail dynamics and current sheet structure. The approach is to follow ion trajectories in a global model of the magnetotail, use a Boltzmann approximation to include electrons, and then to update the field model according to the currents that are generated by the cross-tail electric field and/or induced fields. Parallel (and perpendicular) electric fields that form are included through the Boltzmann relation....
Topics: NASA Technical Reports Server (NTRS), ELECTRIC FIELDS, GEOMAGNETIC TAIL, ELECTRONS, ADIABATIC...
The partitioning of the major ion densities throughout the torus is described. This description is required as input information for the Io oxygen and sulfur cloud models. In the radial interval from 4.9 to 5.4 Rj ion partitioning information is used to initially explore that impact of charge exchange reactions between the neutral gas clouds and the plasma torus ions. Because of the spatial distribution of torus ions, these reactions may be able to introduce a magnetic longitudinal effect in...
Topics: NASA Technical Reports Server (NTRS), CHARGE EXCHANGE, IO, ION DENSITY (CONCENTRATION), SATELLITE...
209
209
Sep 20, 2010
09/10
by
Smith, Guy A.; Workman, Gary L
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eye 209
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A reduced gravity fiber pulling apparatus (FPA) was constructed in order to study the effects of gravity on glass fiber formation. The apparatus was specifically designed and built for use on NASA's KC-135 aircraft. Four flights have been completed to date during which E-glass fiber was successfully produced in simulated zero, high, and lunar gravity environments. In addition simulated lunar soil samples were tested for their fiber producing properties using the FPA.
Topics: ATMOSPHERIC COMPOSITION, COMET TAILS, ION TEMPERATURE, MASS SPECTROSCOPY, COMETARY ATMOSPHERES,...
A quantitative theory of ionization in diffuse clouds is developed which includes H(+) charge exchange with O. Dissociative charge exchange of He(+) with H2 plays an important role in the densities of H(+) and He(+). The abundance of HD is also discussed.
Topics: NASA Technical Reports Server (NTRS), ELECTRON DENSITY (CONCENTRATION), INTERSTELLAR GAS, ION...
The analysis of ion data from retarding potential analyzers (RPA's) is generally done under the planar approximation, which assumes that the grid transparency is constant with angle of incidence and that all ions reaching the plane of the collectors are collected. These approximations are not valid for situations in which the ion thermal velocity is comparable to the vehicle velocity, causing ions to enter the RPA with high average transverse velocity. To investigate these effects, the...
Topics: NASA Technical Reports Server (NTRS), ANALYZERS, GRIDS, ION DENSITY (CONCENTRATION), ION...
The structural nature of the earth's plasmasphere at onset and immediately following an intense magnetic storm is examined. Thermal proton density measurements by the RF ion mass spectrometer on the low altitude polar orbiting satellite OGO-4 were compared on five consecutive nightside passes during the early recovery stage of an intense storm occuring in September 1967. Observational results revealed (1) characteristic termination of the dense plasmapause, (2) secondary enhancement of the ion...
Topics: NASA Technical Reports Server (NTRS), COMET TAILS, EARTH MAGNETOSPHERE, MAGNETIC STORMS, OGO-4,...
161
161
May 23, 2011
05/11
by
Walker, Robert M
texts
eye 161
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Secondary ion mass spectrometry (SIMS) chemical and isotopic analysis was performed on impacts on flat targets flow on the Long Duration Exposure Facility (LDEF) with the purpose of obtaining data useful for the design of the Cosmic Dust Collector Facility (CDCF). Initial examination of experiment AO187-2, an array of 237 capture cells with each cell consisting of high purity Ge plates separated slightly from metallized thin plastic entrance foils, had demonstrated the superior sensitivity of...
Topics: ELECTRIC PROPULSION, NUMERICAL CONTROL, PLASMA POTENTIALS, ION ENGINES, RESEARCH FACILITIES, SPACE...
A preliminary report on the identification and optimization of independent variables which affect the ion density and confinement time in a bumpy torus plasma is presented. The independent variables include the polarity, position, and number of the midplane electrode rings, the method of gas injection, and the polarity and strength of a weak vertical magnetic field. Some characteristic data taken under condition when most of the independent variables were optimized are presented. The highest...
Topics: NASA Technical Reports Server (NTRS), ION DENSITY (CONCENTRATION), MAGNETIC FIELD CONFIGURATIONS,...
217
217
May 23, 2011
05/11
by
Bansal, Narottam P
texts
eye 217
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Unidirectional SrO Al2O3 2SiO2 glass-ceramic matrix composites reinforced with uncoated Chemical Vapor Deposited (CVD) SiC (SCS-0) fibers have been fabricated by hot-pressing under appropriate conditions using the glass-ceramic approach. Almost fully dense composites having a fiber volume fraction of 0.24 have been obtained. Monoclinic celsian, SrAl2Si2O8, was the only crystalline phase observed in the matrix by x-ray diffraction. No chemical reaction was observed between the fiber and the...
Topics: F REGION, ION DENSITY (CONCENTRATION), POLAR CUSPS, TIME DEPENDENCE, ATMOSPHERIC IONIZATION, POLAR...
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157
May 23, 2011
05/11
by
Tsintikidis, D.; Gurnett, D. A.; Kurth, W. S.; Granroth, L. J
texts
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Wideband waveform data obtained by the plasma wave instruments onboard the Voyager 1 and 2 spacecraft have been used to study micron-sized dust particles in the vicinity of Jupiter. The technique used was developed during the flybys of Saturn, Uranus, and Neptune, and makes use of the fact that a particle striking the spacecraft at 10-20 km/s causes a voltage pulse in the plasma wave receiver. The waveform of the voltage pulse is much different than the waveform of plasma waves and provides a...
Topics: BUBBLES, ION DENSITY (CONCENTRATION), WIND MEASUREMENT, DRIFT RATE, PERTURBATION, GRAVITY WAVES, F...
A brief sketch of the theory concerning the use of the Gerdien condenser as a mobility spectrometer is presented. Data reduction of three parachute borne Gerdien condenser probes is given, as well as that of one blunt conductivity probe. Comparisons of concentrations calculated by two different methods indicate consistency of results. Mobility profiles demonstrating remarkable fine structure are discussed in detail. Finally, theoretical implications of the results on ionospheric structure,...
Topics: NASA Technical Reports Server (NTRS), GERDIEN CONDENSERS, ION DENSITY (CONCENTRATION), IONIC...
Unexpectedly abrupt and pronounced distributions of the thermal molecular ions NO(+), O2(+) and N2(+) were observed at mid and high latitudes by the OGO-6 ion mass spectrometer. These minor ions may reach concentration levels exceeding 1000 ions/cu cm at altitudes as great as 1000 km, suggestive of scale heights well in excess of those inferred from low and mid-latitude measurements, under relatively undisturbed conditions. The high latitude ion enhancements were observed to be narrowly defined...
Topics: NASA Technical Reports Server (NTRS), ION DENSITY (CONCENTRATION), MASS SPECTROMETERS, OGO-6,...
An intercomparison is made of the wavelike structures in the data from the light ion mass spectrometer and the fluxgate magnetometer on OGO 5. The wavelike structures appear simultaneously in the data from both experiments. The waves contain both transverse and compressional modes and exhibit periods of 100 to 200 seconds. The waves are usually observed outside the plasmapause and are located primarily on the dayside of the magnetosphere. One possible cause of the apparent density fluctuation...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, MASS SPECTROSCOPY, PLASMA WAVES,...
Etching of semiconductor materials is reliant on plasma properties. Quantities such as ion and neutral fluxes, both in magnitude and in direction, are often determined by reactor geometry (height, radius, position of the coils, etc.) In order to obtain accurate etching profiles, one must also model the plasma as a whole to obtain local fluxes and distributions. We have developed a set of three models that simulates C12 plasmas for etching of silicon, ion and neutral trajectories in the plasma,...
Topics: NASA Technical Reports Server (NTRS), PLASMA ETCHING, SEMICONDUCTORS (MATERIALS), ION DENSITY...
The daytime ionosphere of Venus is observed between 100 and 500 km altitude. Below 200 km, CO2(+) is thought to be the principal ion unless oxygen is present. It was suggested that at altitudes less than 130 km the ion CO2(+)-CO2 is an important ionic constituent of the Venus ionosphere. Below 100 km, ion clustering processes combine with the low temperature at the mesopause to form coagulates giving rise to the ultraviolet haze layer which is frequently observed.
Topics: NASA Technical Reports Server (NTRS), HAZE, ION DENSITY (CONCENTRATION), LOW TEMPERATURE,...
Extensive observations of mid-latitude depletions in electron and total ion density by both direct and indirect techniques, have prompted numerous studies of the possible association between these troughs, observed in the F-region, the topside ionosphere, and the plasmapause. One basic problem arises, in that while the plasmapause was detected as a global phenomenon both by VLF and ion composition measurements, the electron and ion density troughs were identified primarily as nightside...
Topics: NASA Technical Reports Server (NTRS), ELECTRON DENSITY (CONCENTRATION), ION DENSITY...
During the MAC/Epsilon campaign a mass spectrometer probe was flown on a rocket launched from Andoya (Norway) on 12 November 1987 at 0021 UT providing partial ion density profiles in the altitude range between less than 50 to 125 km. Due to the short sampling period of 0.17 seconds structural features could be observed at approx. 150 m height resolution in the regimes where metal ions occur and where cluster ions are dominant. The observations were made during stable ionospheric absorption of 1...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC COMPOSITION, D REGION, E REGION, ION DENSITY...
The velocity distribution function of He(+) in the solar wind at 1 AU is calculated with the assumption that the source is photoionization of a cold (T = 100 K), neutral interstellar wind. If the spiral magnetic field is noise free, the velocity distribution is diffuse and would not produce a peak at 4(E over Q) sub H in an E over Q particle spectrum. If the velocity of the interstellar wind with respect to the sun lies in the ecliptic, a large variation of the He(+) number density with respect...
Topics: NASA Technical Reports Server (NTRS), HELIUM IONS, ION DENSITY (CONCENTRATION), SOLAR WIND, COSMIC...
Analytic plasma theory and numerical solutions of the dispersion equation are used to show that the assumption that the linear properties of the waves are determined by a charge-neutral plasma in the absence of the nonthermal particles, while the nonthermal particles cause growth or additional damping superposed onto the background, is seriously flawed even for stable plasmas. Even when the nonthermal particles do not contribute significantly to the dispersion equation, unequal thermal electron...
Topics: NASA Technical Reports Server (NTRS), MAGNETOHYDRODYNAMIC WAVES, PLASMA DENSITY, PLASMA DIFFUSION,...
190
190
Jul 12, 2010
07/10
by
Mikhail, E. M.; Mcglone, J. C
texts
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The extraction of metric information from scanner (particularly multispectral) data is presented. Data from both aircraft and spacecraft; singly scanned areas and areas with multiple coverage; various mathematical models used up to the present time; and published numerical results are considered. Future trends are also discussed.
Topics: HELIUM, MASS SPECTROMETERS, MATHEMATICAL MODELS, NIGHT SKY, PLASMA EQUILIBRIUM, ULTRAVIOLET...
The fundamental formulas of electrophoresis are derived microscopically and applied to the problem of isotachophoresis. A simple physical model of the isotachophoresis front is proposed. The front motion and structure are studied in the simplified case without convection, diffusion and non-electric external forces.
Topics: NASA Technical Reports Server (NTRS), COLLOIDS, ELECTROPHORESIS, GRAVITATIONAL FIELDS,...
Ion and radical formation in comets are thought to occur primarily by photodissociation of gas phase molecules. Experimental evidence and theoretical calculations are presented that show that some of the radical and ions can come directly from ice grains. The experimental evidence suggest that if the frozen molecules on the surface of grains undergo direct dissociation then they may be able to release radicals directly in the gas phase. If the molecules undergo predissociation it is unlikely...
Topics: NASA Technical Reports Server (NTRS), COMET NUCLEI, COMETS, ICE, IONS, PHOTODISSOCIATION, RADICALS,...
On the nights of October 21 and 28, 1987 (UT), two Nike Orion payloads (NASA 31.066 and 31.067) were launched from Andoya, Norway, as part of the MAC/Epsilon campaign, to study auroral energetics and their effect on the middle atmosphere. Each payload carried instrumentation to measure relativistic electrons from 0.1 to 1.0 MeV in 12 differential channels, and Bremsstrahlung X-rays from greater than 5 to greater than 80 KeV in 5 integral channels. In addition, instrumentation to measure ion...
Topics: NASA Technical Reports Server (NTRS), AURORAS, ELECTRIC FIELDS, ION DENSITY (CONCENTRATION), MIDDLE...
The atomic oxygen concentration in the altitude range 130 to 240 km was determined through the use of a quadrupole spectrometer with a strongly focussing ion source. The instrument is used in the Thermosphere Probe in a manner that greatly increases the proportion of measured oxygen ions that have not experienced a surface collision and permits quantitative evaluation of surface recombination and thermalization effects which inevitably enter all spectrometer determinations. The data obtained...
Topics: NASA Technical Reports Server (NTRS), GAS DENSITY, MASS SPECTROMETERS, OXYGEN, THERMOSPHERE, ION...
